21539839400448 has 80 divisors (see below), whose sum is σ = 57392059068960. Its totient is φ = 7178872836096.

The previous prime is 21539839400437. The next prime is 21539839400473. The reversal of 21539839400448 is 84400493893512.

It is a happy number.

It is a super-2 number, since 2×21539839400448² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21539839400391 and 21539839400400.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9259911 + ... + 11350137.

It is an arithmetic number, because the mean of its divisors is an integer number (717400738362).

Almost surely, 2^{21539839400448} is an apocalyptic number.

It is an amenable number.

21539839400448 is an abundant number, since it is smaller than the sum of its proper divisors (35852219668512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21539839400448 is an equidigital number, since it uses as much as digits as its factorization.

21539839400448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096957 (or 2096941 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 60.

The spelling of 21539839400448 in words is "twenty-one trillion, five hundred thirty-nine billion, eight hundred thirty-nine million, four hundred thousand, four hundred forty-eight".