21754340751 has 96 divisors (see below), whose sum is σ = 36794145024. Its totient is φ = 11229926400.

The previous prime is 21754340693. The next prime is 21754340767. The reversal of 21754340751 is 15704345712.

It is not a de Polignac number, because 21754340751 - 2⁷ = 21754340623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21754340771) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 103101036 + ... + 103101246.

It is an arithmetic number, because the mean of its divisors is an integer number (383272344).

Almost surely, 2^21754340751 is an apocalyptic number.

21754340751 is a deficient number, since it is larger than the sum of its proper divisors (15039804273).

21754340751 is a wasteful number, since it uses less digits than its factorization.

21754340751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 39.

The spelling of 21754340751 in words is "twenty-one billion, seven hundred fifty-four million, three hundred forty thousand, seven hundred fifty-one".