21000520528031 has 8 divisors (see below), whose sum is σ = 24257285743824. Its totient is φ = 17968359809920.

The previous prime is 21000520528027. The next prime is 21000520528073. The reversal of 21000520528031 is 13082502500012.

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

It is not a de Polignac number, because 21000520528031 - 2² = 21000520528027 is a prime.

It is a super-2 number, since 2×21000520528031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000520527985 and 21000520528003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000520528081) 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, 56151124220 + ... + 56151124593.

It is an arithmetic number, because the mean of its divisors is an integer number (3032160717978).

Almost surely, 2^{21000520528031} is an apocalyptic number.

21000520528031 is a deficient number, since it is larger than the sum of its proper divisors (3256765215793).

21000520528031 is a wasteful number, since it uses less digits than its factorization.

21000520528031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112302248841.

The product of its (nonzero) digits is 4800, while the sum is 29.

The spelling of 21000520528031 in words is "twenty-one trillion, five hundred twenty million, five hundred twenty-eight thousand, thirty-one".