21221023020989 has 8 divisors (see below), whose sum is σ = 23467333055232. Its totient is φ = 19027567340640.

The previous prime is 21221023020961. The next prime is 21221023021001. The reversal of 21221023020989 is 98902032012212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221023020989 - 2²⁰ = 21221021972413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221023020919) 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, 13213587629 + ... + 13213589234.

It is an arithmetic number, because the mean of its divisors is an integer number (2933416631904).

Almost surely, 2^{21221023020989} is an apocalyptic number.

It is an amenable number.

21221023020989 is a deficient number, since it is larger than the sum of its proper divisors (2246310034243).

21221023020989 is a wasteful number, since it uses less digits than its factorization.

21221023020989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26427176947.

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 21221023020989 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-three million, twenty thousand, nine hundred eighty-nine".