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121221012 = 22311918341
BaseRepresentation
bin1110011100110…
…10111110010100
322110002122222010
413032122332110
5222013033022
620010104220
73001235013
oct716327624
9273078863
10121221012
1162476160
123471b070
131c163913
1412156a7a
15a99750c
hex739af94

121221012 has 24 divisors (see below), whose sum is σ = 308562912. Its totient is φ = 36733600.

The previous prime is 121220993. The next prime is 121221013. The reversal of 121221012 is 210122121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459039 + ... + 459302.

It is an arithmetic number, because the mean of its divisors is an integer number (12856788).

Almost surely, 2121221012 is an apocalyptic number.

121221012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121221012 is an abundant number, since it is smaller than the sum of its proper divisors (187341900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121221012 is a wasteful number, since it uses less digits than its factorization.

121221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918359 (or 918357 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 121221012 is about 11010.0414168158. The cubic root of 121221012 is about 494.9097029456.

Adding to 121221012 its reverse (210122121), we get a palindrome (331343133).

The spelling of 121221012 in words is "one hundred twenty-one million, two hundred twenty-one thousand, twelve".

Divisors: 1 2 3 4 6 11 12 22 33 44 66 132 918341 1836682 2755023 3673364 5510046 10101751 11020092 20203502 30305253 40407004 60610506 121221012