21520471360036 has 12 divisors (see below), whose sum is σ = 41084536232880. Its totient is φ = 9782032436360.

The previous prime is 21520471360007. The next prime is 21520471360043. The reversal of 21520471360036 is 63006317402512.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244550810866 + ... + 244550810953.

It is an arithmetic number, because the mean of its divisors is an integer number (3423711352740).

Almost surely, 2^{21520471360036} is an apocalyptic number.

It is an amenable number.

21520471360036 is a deficient number, since it is larger than the sum of its proper divisors (19564064872844).

21520471360036 is a wasteful number, since it uses less digits than its factorization.

21520471360036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489101621834 (or 489101621832 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

Adding to 21520471360036 its reverse (63006317402512), we get a palindrome (84526788762548).

The spelling of 21520471360036 in words is "twenty-one trillion, five hundred twenty billion, four hundred seventy-one million, three hundred sixty thousand, thirty-six".