121211730 has 48 divisors (see below), whose sum is σ = 316330560. Its totient is φ = 32202144.

The previous prime is 121211729. The next prime is 121211743. The reversal of 121211730 is 37112121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23091 + ... + 27849.

It is an arithmetic number, because the mean of its divisors is an integer number (6590220).

Almost surely, 2^121211730 is an apocalyptic number.

121211730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121211730 is an abundant number, since it is smaller than the sum of its proper divisors (195118830).

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

121211730 is a wasteful number, since it uses less digits than its factorization.

121211730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055 (or 5052 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 121211730 is about 11009.6198844465. The cubic root of 121211730 is about 494.8970707320.

Adding to 121211730 its reverse (37112121), we get a palindrome (158323851).

The spelling of 121211730 in words is "one hundred twenty-one million, two hundred eleven thousand, seven hundred thirty".