1221213152580 has 96 divisors (see below), whose sum is σ = 3425772631680. Its totient is φ = 325050163200.

The previous prime is 1221213152573. The next prime is 1221213152581. The reversal of 1221213152580 is 852513121221.

It is not an unprimeable number, because it can be changed into a prime (1221213152581) 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, 84793380 + ... + 84807780.

It is an arithmetic number, because the mean of its divisors is an integer number (35685131580).

Almost surely, 2^{1221213152580} is an apocalyptic number.

1221213152580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221213152580 is an abundant number, since it is smaller than the sum of its proper divisors (2204559479100).

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

1221213152580 is a wasteful number, since it uses less digits than its factorization.

1221213152580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16949 (or 16947 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 33.

The spelling of 1221213152580 in words is "one trillion, two hundred twenty-one billion, two hundred thirteen million, one hundred fifty-two thousand, five hundred eighty".