1221203321292 has 24 divisors (see below), whose sum is σ = 2850031206400. Its totient is φ = 406988232336.

The previous prime is 1221203321291. The next prime is 1221203321311. The reversal of 1221203321292 is 2921233021221.

It is a super-2 number, since 2×1221203321292² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221203321291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9878692 + ... + 10001547.

Almost surely, 2^{1221203321292} is an apocalyptic number.

1221203321292 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221203321292 is an abundant number, since it is smaller than the sum of its proper divisors (1628827885108).

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

1221203321292 is a wasteful number, since it uses less digits than its factorization.

1221203321292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19885365 (or 19885363 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The spelling of 1221203321292 in words is "one trillion, two hundred twenty-one billion, two hundred three million, three hundred twenty-one thousand, two hundred ninety-two".