21135747675 has 72 divisors (see below), whose sum is σ = 42424197376. Its totient is φ = 9093634560.

The previous prime is 21135747667. The next prime is 21135747697. The reversal of 21135747675 is 57674753112.

It is not a de Polignac number, because 21135747675 - 2³ = 21135747667 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 82074 + ... + 221376.

Almost surely, 2^21135747675 is an apocalyptic number.

21135747675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21135747675 is an abundant number, since it is smaller than the sum of its proper divisors (21288449701).

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

21135747675 is a wasteful number, since it uses less digits than its factorization.

21135747675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139357 (or 139335 counting only the distinct ones).

The product of its digits is 1234800, while the sum is 48.

The spelling of 21135747675 in words is "twenty-one billion, one hundred thirty-five million, seven hundred forty-seven thousand, six hundred seventy-five".