21891482536 has 64 divisors (see below), whose sum is σ = 52825743360. Its totient is φ = 8254008000.

The previous prime is 21891482461. The next prime is 21891482551. The reversal of 21891482536 is 63528419812.

It is a self number, because there is not a number n which added to its sum of digits gives 21891482536.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 554100 + ... + 592291.

It is an arithmetic number, because the mean of its divisors is an integer number (825402240).

Almost surely, 2^21891482536 is an apocalyptic number.

It is an amenable number.

21891482536 is an abundant number, since it is smaller than the sum of its proper divisors (30934260824).

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

21891482536 is a wasteful number, since it uses less digits than its factorization.

21891482536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146446 (or 1146442 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The spelling of 21891482536 in words is "twenty-one billion, eight hundred ninety-one million, four hundred eighty-two thousand, five hundred thirty-six".