21107157754 has 16 divisors (see below), whose sum is σ = 32827132800. Its totient is φ = 10166439024.

The previous prime is 21107157749. The next prime is 21107157781. The reversal of 21107157754 is 45775170112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389022 + ... + 439945.

It is an arithmetic number, because the mean of its divisors is an integer number (2051695800).

Almost surely, 2^21107157754 is an apocalyptic number.

21107157754 is a deficient number, since it is larger than the sum of its proper divisors (11719975046).

21107157754 is a wasteful number, since it uses less digits than its factorization.

21107157754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829437.

The product of its (nonzero) digits is 68600, while the sum is 40.

The spelling of 21107157754 in words is "twenty-one billion, one hundred seven million, one hundred fifty-seven thousand, seven hundred fifty-four".