21761335253 has 32 divisors (see below), whose sum is σ = 26326536192. Its totient is φ = 17585568000.

The previous prime is 21761335237. The next prime is 21761335273. The reversal of 21761335253 is 35253316712.

It is not a de Polignac number, because 21761335253 - 2⁴ = 21761335237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21761335213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3181325 + ... + 3188157.

It is an arithmetic number, because the mean of its divisors is an integer number (822704256).

Almost surely, 2^21761335253 is an apocalyptic number.

21761335253 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21761335253 is a deficient number, since it is larger than the sum of its proper divisors (4565200939).

21761335253 is a wasteful number, since it uses less digits than its factorization.

21761335253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7145.

The product of its digits is 113400, while the sum is 38.

The spelling of 21761335253 in words is "twenty-one billion, seven hundred sixty-one million, three hundred thirty-five thousand, two hundred fifty-three".