21602427434044 has 24 divisors (see below), whose sum is σ = 40028483251008. Its totient is φ = 10165732408320.

The previous prime is 21602427433981. The next prime is 21602427434053. The reversal of 21602427434044 is 44043472420612.

It is a congruent number.

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, 4357812 + ... + 7886404.

It is an arithmetic number, because the mean of its divisors is an integer number (1667853468792).

Almost surely, 2^{21602427434044} is an apocalyptic number.

It is an amenable number.

21602427434044 is a deficient number, since it is larger than the sum of its proper divisors (18426055816964).

21602427434044 is a wasteful number, since it uses less digits than its factorization.

21602427434044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3618645 (or 3618643 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 43.

Adding to 21602427434044 its reverse (44043472420612), we get a palindrome (65645899854656).

The spelling of 21602427434044 in words is "twenty-one trillion, six hundred two billion, four hundred twenty-seven million, four hundred thirty-four thousand, forty-four".