21221021120985 has 48 divisors (see below), whose sum is σ = 42423500570880. Its totient is φ = 9612037860480.

The previous prime is 21221021120977. The next prime is 21221021121059. The reversal of 21221021120985 is 58902112012212.

21221021120985 is a `hidden beast` number, since 21 + 2 + 210 + 211 + 209 + 8 + 5 = 666.

It is not a de Polignac number, because 21221021120985 - 2³ = 21221021120977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 308994661 + ... + 309063330.

It is an arithmetic number, because the mean of its divisors is an integer number (883822928560).

Almost surely, 2^{21221021120985} is an apocalyptic number.

It is an amenable number.

21221021120985 is a deficient number, since it is larger than the sum of its proper divisors (21202479449895).

21221021120985 is a wasteful number, since it uses less digits than its factorization.

21221021120985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618058118 (or 618058115 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The spelling of 21221021120985 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-one million, one hundred twenty thousand, nine hundred eighty-five".