21878528700431 has 8 divisors (see below), whose sum is σ = 24801570996720. Its totient is φ = 19132640482752.

The previous prime is 21878528700407. The next prime is 21878528700433. The reversal of 21878528700431 is 13400782587812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21878528700431 is a prime.

It is a super-2 number, since 2×21878528700431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21878528700433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44288519390 + ... + 44288519883.

It is an arithmetic number, because the mean of its divisors is an integer number (3100196374590).

Almost surely, 2^{21878528700431} is an apocalyptic number.

21878528700431 is a deficient number, since it is larger than the sum of its proper divisors (2923042296289).

21878528700431 is a wasteful number, since it uses less digits than its factorization.

21878528700431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88577039305.

The product of its (nonzero) digits is 6021120, while the sum is 56.

The spelling of 21878528700431 in words is "twenty-one trillion, eight hundred seventy-eight billion, five hundred twenty-eight million, seven hundred thousand, four hundred thirty-one".