21757254454 has 8 divisors (see below), whose sum is σ = 35146334160. Its totient is φ = 10041809736.

The previous prime is 21757254443. The next prime is 21757254469. The reversal of 21757254454 is 45445275712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21757254454² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418408714 + ... + 418408765.

It is an arithmetic number, because the mean of its divisors is an integer number (4393291770).

Almost surely, 2^21757254454 is an apocalyptic number.

21757254454 is a deficient number, since it is larger than the sum of its proper divisors (13389079706).

21757254454 is a wasteful number, since it uses less digits than its factorization.

21757254454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836817494.

The product of its digits is 1568000, while the sum is 46.

The spelling of 21757254454 in words is "twenty-one billion, seven hundred fifty-seven million, two hundred fifty-four thousand, four hundred fifty-four".