21023062009572 has 144 divisors (see below), whose sum is σ = 58191436800000. Its totient is φ = 5888331199296.

The previous prime is 21023062009559. The next prime is 21023062009597. The reversal of 21023062009572 is 27590026032012.

It is a self number, because there is not a number n which added to its sum of digits gives 21023062009572.

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, 11610429 + ... + 13298427.

It is an arithmetic number, because the mean of its divisors is an integer number (404107200000).

Almost surely, 2^{21023062009572} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023062009572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29095718400000).

21023062009572 is an abundant number, since it is smaller than the sum of its proper divisors (37168374790428).

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

21023062009572 is a wasteful number, since it uses less digits than its factorization.

21023062009572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688438 (or 1688429 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 21023062009572 in words is "twenty-one trillion, twenty-three billion, sixty-two million, nine thousand, five hundred seventy-two".