21500452431052 has 24 divisors (see below), whose sum is σ = 43190336173824. Its totient is φ = 9173887189392.

The previous prime is 21500452431037. The next prime is 21500452431083. The reversal of 21500452431052 is 25013425400512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21500452430999 and 21500452431017.

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, 1691344528 + ... + 1691357239.

It is an arithmetic number, because the mean of its divisors is an integer number (1799597340576).

Almost surely, 2^{21500452431052} is an apocalyptic number.

It is an amenable number.

21500452431052 is an abundant number, since it is smaller than the sum of its proper divisors (21689883742772).

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

21500452431052 is a wasteful number, since it uses less digits than its factorization.

21500452431052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3382702005 (or 3382702003 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 21500452431052 its reverse (25013425400512), we get a palindrome (46513877831564).

The spelling of 21500452431052 in words is "twenty-one trillion, five hundred billion, four hundred fifty-two million, four hundred thirty-one thousand, fifty-two".