121221201010 has 32 divisors (see below), whose sum is σ = 268551585792. Its totient is φ = 38364511680.

The previous prime is 121221201001. The next prime is 121221201029. The reversal of 121221201010 is 10102122121.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66604146 + ... + 66605965.

It is an arithmetic number, because the mean of its divisors is an integer number (8392237056).

Almost surely, 2^121221201010 is an apocalyptic number.

121221201010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221201010 is an abundant number, since it is smaller than the sum of its proper divisors (147330384782).

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

121221201010 is a wasteful number, since it uses less digits than its factorization.

121221201010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133210138.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121221201010 its reverse (10102122121), we get a palindrome (131323323131).

The spelling of 121221201010 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, ten".