21134865534 has 32 divisors (see below), whose sum is σ = 43432228896. Its totient is φ = 6851381760.

The previous prime is 21134865533. The next prime is 21134865581. The reversal of 21134865534 is 43556843112.

It is a super-2 number, since 2×21134865534² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134865533) 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, 485514 + ... + 527250.

It is an arithmetic number, because the mean of its divisors is an integer number (1357257153).

Almost surely, 2^21134865534 is an apocalyptic number.

21134865534 is an abundant number, since it is smaller than the sum of its proper divisors (22297363362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21134865534 is a wasteful number, since it uses less digits than its factorization.

21134865534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44060.

The product of its digits is 345600, while the sum is 42.

The spelling of 21134865534 in words is "twenty-one billion, one hundred thirty-four million, eight hundred sixty-five thousand, five hundred thirty-four".