21144540136 has 16 divisors (see below), whose sum is σ = 41369752800. Its totient is φ = 10112606064.

The previous prime is 21144540107. The next prime is 21144540161. The reversal of 21144540136 is 63104544112.

It is a junction number, because it is equal to n+sod(n) for n = 21144540098 and 21144540107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57457806 + ... + 57458173.

It is an arithmetic number, because the mean of its divisors is an integer number (2585609550).

Almost surely, 2^21144540136 is an apocalyptic number.

It is an amenable number.

21144540136 is a deficient number, since it is larger than the sum of its proper divisors (20225212664).

21144540136 is a wasteful number, since it uses less digits than its factorization.

21144540136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114916008 (or 114916004 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 21144540136 in words is "twenty-one billion, one hundred forty-four million, five hundred forty thousand, one hundred thirty-six".