21537425520226 has 16 divisors (see below), whose sum is σ = 40277782791360. Its totient is φ = 8391204748080.

The previous prime is 21537425520223. The next prime is 21537425520307. The reversal of 21537425520226 is 62202552473512.

It is not an unprimeable number, because it can be changed into a prime (21537425520223) 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, 69926706081 + ... + 69926706388.

It is an arithmetic number, because the mean of its divisors is an integer number (2517361424460).

Almost surely, 2^{21537425520226} is an apocalyptic number.

21537425520226 is a deficient number, since it is larger than the sum of its proper divisors (18740357271134).

21537425520226 is a wasteful number, since it uses less digits than its factorization.

21537425520226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139853412489.

The product of its (nonzero) digits is 2016000, while the sum is 46.

Adding to 21537425520226 its reverse (62202552473512), we get a palindrome (83739977993738).

The spelling of 21537425520226 in words is "twenty-one trillion, five hundred thirty-seven billion, four hundred twenty-five million, five hundred twenty thousand, two hundred twenty-six".