21532004031 has 32 divisors (see below), whose sum is σ = 29608104960. Its totient is φ = 13912464384.

The previous prime is 21532003951. The next prime is 21532004057. The reversal of 21532004031 is 13040023512.

It is not a de Polignac number, because 21532004031 - 2¹³ = 21531995839 is a prime.

It is a super-2 number, since 2×21532004031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21532003989 and 21532004007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532054031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11458350 + ... + 11460228.

It is an arithmetic number, because the mean of its divisors is an integer number (925253280).

Almost surely, 2^21532004031 is an apocalyptic number.

21532004031 is a deficient number, since it is larger than the sum of its proper divisors (8076100929).

21532004031 is a wasteful number, since it uses less digits than its factorization.

21532004031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21532004031 its reverse (13040023512), we get a palindrome (34572027543).

The spelling of 21532004031 in words is "twenty-one billion, five hundred thirty-two million, four thousand, thirty-one".