21403512135 has 48 divisors (see below), whose sum is σ = 37762888800. Its totient is φ = 11212058880.

The previous prime is 21403512113. The next prime is 21403512139. The reversal of 21403512135 is 53121530412.

21403512135 is a `hidden beast` number, since 2 + 14 + 0 + 3 + 512 + 135 = 666.

It is not a de Polignac number, because 21403512135 - 2⁶ = 21403512071 is a prime.

It is a super-2 number, since 2×21403512135² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21403512099 and 21403512108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403512139) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1042065 + ... + 1062405.

It is an arithmetic number, because the mean of its divisors is an integer number (786726850).

Almost surely, 2^21403512135 is an apocalyptic number.

21403512135 is a deficient number, since it is larger than the sum of its proper divisors (16359376665).

21403512135 is a wasteful number, since it uses less digits than its factorization.

21403512135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20768 (or 20765 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 21403512135 in words is "twenty-one billion, four hundred three million, five hundred twelve thousand, one hundred thirty-five".