21756047338054 has 4 divisors (see below), whose sum is σ = 32634071007084. Its totient is φ = 10878023669026.

The previous prime is 21756047338033. The next prime is 21756047338061. The reversal of 21756047338054 is 45083374065712.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21756047337986 and 21756047338004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5439011834512 + ... + 5439011834515.

It is an arithmetic number, because the mean of its divisors is an integer number (8158517751771).

Almost surely, 2^{21756047338054} is an apocalyptic number.

21756047338054 is a deficient number, since it is larger than the sum of its proper divisors (10878023669030).

21756047338054 is a wasteful number, since it uses less digits than its factorization.

21756047338054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10878023669029.

The product of its (nonzero) digits is 16934400, while the sum is 55.

The spelling of 21756047338054 in words is "twenty-one trillion, seven hundred fifty-six billion, forty-seven million, three hundred thirty-eight thousand, fifty-four".