21532135031 has 16 divisors (see below), whose sum is σ = 24258382848. Its totient is φ = 18934593600.

The previous prime is 21532134991. The next prime is 21532135039. The reversal of 21532135031 is 13053123512.

It is a cyclic number.

It is not a de Polignac number, because 21532135031 - 2²² = 21527940727 is a prime.

It is a super-2 number, since 2×21532135031² (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 (21532135039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 802820 + ... + 829206.

It is an arithmetic number, because the mean of its divisors is an integer number (1516148928).

Almost surely, 2^21532135031 is an apocalyptic number.

21532135031 is a deficient number, since it is larger than the sum of its proper divisors (2726247817).

21532135031 is a wasteful number, since it uses less digits than its factorization.

21532135031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28822.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 21532135031 its reverse (13053123512), we get a palindrome (34585258543).

The spelling of 21532135031 in words is "twenty-one billion, five hundred thirty-two million, one hundred thirty-five thousand, thirty-one".