21140512535 has 16 divisors (see below), whose sum is σ = 25906288320. Its totient is φ = 16555418880.

The previous prime is 21140512531. The next prime is 21140512541. The reversal of 21140512535 is 53521504112.

It is not a de Polignac number, because 21140512535 - 2² = 21140512531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21140512498 and 21140512507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140512531) 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, 25475 + ... + 207195.

It is an arithmetic number, because the mean of its divisors is an integer number (1619143020).

Almost surely, 2^21140512535 is an apocalyptic number.

21140512535 is a deficient number, since it is larger than the sum of its proper divisors (4765775785).

21140512535 is a wasteful number, since it uses less digits than its factorization.

21140512535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182218.

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 21140512535 in words is "twenty-one billion, one hundred forty million, five hundred twelve thousand, five hundred thirty-five".