21438631583 has 8 divisors (see below), whose sum is σ = 21911568000. Its totient is φ = 20969347608.

The previous prime is 21438631567. The next prime is 21438631607. The reversal of 21438631583 is 38513683412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21438631583 - 2⁴ = 21438631567 is a prime.

It is a super-2 number, since 2×21438631583² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21438631283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901241 + ... + 924722.

It is an arithmetic number, because the mean of its divisors is an integer number (2738946000).

Almost surely, 2^21438631583 is an apocalyptic number.

21438631583 is a deficient number, since it is larger than the sum of its proper divisors (472936417).

21438631583 is a wasteful number, since it uses less digits than its factorization.

21438631583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826221.

The product of its digits is 414720, while the sum is 44.

The spelling of 21438631583 in words is "twenty-one billion, four hundred thirty-eight million, six hundred thirty-one thousand, five hundred eighty-three".