21420534032 has 40 divisors (see below), whose sum is σ = 43697277600. Its totient is φ = 10144092672.

The previous prime is 21420534019. The next prime is 21420534059. The reversal of 21420534032 is 23043502412.

It is a junction number, because it is equal to n+sod(n) for n = 21420533992 and 21420534010.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2042819 + ... + 2053277.

It is an arithmetic number, because the mean of its divisors is an integer number (1092431940).

Almost surely, 2^21420534032 is an apocalyptic number.

It is an amenable number.

21420534032 is an abundant number, since it is smaller than the sum of its proper divisors (22276743568).

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

21420534032 is a wasteful number, since it uses less digits than its factorization.

21420534032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17223 (or 17217 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The spelling of 21420534032 in words is "twenty-one billion, four hundred twenty million, five hundred thirty-four thousand, thirty-two".