1221010121000 has 64 divisors (see below), whose sum is σ = 2857555584000. Its totient is φ = 488337057600.

The previous prime is 1221010120997. The next prime is 1221010121011. The reversal of 1221010121000 is 1210101221.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7559081 + ... + 7718919.

It is an arithmetic number, because the mean of its divisors is an integer number (44649306000).

Almost surely, 2^{1221010121000} is an apocalyptic number.

1221010121000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221010121000 is an abundant number, since it is smaller than the sum of its proper divisors (1636545463000).

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

1221010121000 is a wasteful number, since it uses less digits than its factorization.

1221010121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167499 (or 167485 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221010121000 its reverse (1210101221), we get a palindrome (1222220222221).

The spelling of 1221010121000 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred twenty-one thousand".