21754435572051 has 48 divisors (see below), whose sum is σ = 36341955165600. Its totient is φ = 11473327337472.

The previous prime is 21754435572049. The next prime is 21754435572059. The reversal of 21754435572051 is 15027553445712.

It is not a de Polignac number, because 21754435572051 - 2¹ = 21754435572049 is a prime.

It is a super-2 number, since 2×21754435572051² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21754435571985 and 21754435572003.

It is not an unprimeable number, because it can be changed into a prime (21754435572059) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13551445 + ... + 15071513.

It is an arithmetic number, because the mean of its divisors is an integer number (757124065950).

Almost surely, 2^{21754435572051} is an apocalyptic number.

21754435572051 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21754435572051 is a deficient number, since it is larger than the sum of its proper divisors (14587519593549).

21754435572051 is a wasteful number, since it uses less digits than its factorization.

21754435572051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527588 (or 1527581 counting only the distinct ones).

The product of its (nonzero) digits is 5880000, while the sum is 51.

The spelling of 21754435572051 in words is "twenty-one trillion, seven hundred fifty-four billion, four hundred thirty-five million, five hundred seventy-two thousand, fifty-one".