21613421583 has 12 divisors (see below), whose sum is σ = 33620878200. Its totient is φ = 13300567056.

The previous prime is 21613421497. The next prime is 21613421663. The reversal of 21613421583 is 38512431612.

21613421583 is a `hidden beast` number, since 2 + 161 + 342 + 158 + 3 = 666.

It is not a de Polignac number, because 21613421583 - 2¹³ = 21613413391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21613421083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92364933 + ... + 92365166.

It is an arithmetic number, because the mean of its divisors is an integer number (2801739850).

Almost surely, 2^21613421583 is an apocalyptic number.

21613421583 is a deficient number, since it is larger than the sum of its proper divisors (12007456617).

21613421583 is a wasteful number, since it uses less digits than its factorization.

21613421583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184730118 (or 184730115 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The spelling of 21613421583 in words is "twenty-one billion, six hundred thirteen million, four hundred twenty-one thousand, five hundred eighty-three".