1221025521252 has 96 divisors (see below), whose sum is σ = 2883139459200. Its totient is φ = 402171973632.

The previous prime is 1221025521227. The next prime is 1221025521253. The reversal of 1221025521252 is 2521255201221.

It is not an unprimeable number, because it can be changed into a prime (1221025521253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 447424624 + ... + 447427352.

It is an arithmetic number, because the mean of its divisors is an integer number (30032702700).

Almost surely, 2^{1221025521252} is an apocalyptic number.

1221025521252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221025521252 is an abundant number, since it is smaller than the sum of its proper divisors (1662113937948).

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

1221025521252 is a wasteful number, since it uses less digits than its factorization.

1221025521252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4045 (or 4043 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The spelling of 1221025521252 in words is "one trillion, two hundred twenty-one billion, twenty-five million, five hundred twenty-one thousand, two hundred fifty-two".