121121211012 has 96 divisors (see below), whose sum is σ = 287673458688. Its totient is φ = 39659472384.

The previous prime is 121121210971. The next prime is 121121211037. The reversal of 121121211012 is 210112121121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121121210982 and 121121211000.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79527283 + ... + 79528805.

It is an arithmetic number, because the mean of its divisors is an integer number (2996598528).

Almost surely, 2^121121211012 is an apocalyptic number.

121121211012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121121211012 is an abundant number, since it is smaller than the sum of its proper divisors (166552247676).

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

121121211012 is a wasteful number, since it uses less digits than its factorization.

121121211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129 (or 2127 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121121211012 its reverse (210112121121), we get a palindrome (331233332133).

The spelling of 121121211012 in words is "one hundred twenty-one billion, one hundred twenty-one million, two hundred eleven thousand, twelve".