21602612738 has 16 divisors (see below), whose sum is σ = 37094889600. Its totient is φ = 9242802816.

The previous prime is 21602612729. The next prime is 21602612743. The reversal of 21602612738 is 83721620612.

It is a happy number.

It is a super-4 number, since 4×21602612738⁴ (a number of 42 digits) contains 4444 as substring.

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, 1279631 + ... + 1296402.

It is an arithmetic number, because the mean of its divisors is an integer number (2318430600).

Almost surely, 2^21602612738 is an apocalyptic number.

21602612738 is a deficient number, since it is larger than the sum of its proper divisors (15492276862).

21602612738 is a wasteful number, since it uses less digits than its factorization.

21602612738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576641.

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 21602612738 in words is "twenty-one billion, six hundred two million, six hundred twelve thousand, seven hundred thirty-eight".