21025452233604 has 48 divisors (see below), whose sum is σ = 60380785904768. Its totient is φ = 5545174215168.

The previous prime is 21025452233587. The next prime is 21025452233609. The reversal of 21025452233604 is 40633225452012.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (21025452233609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9627037477 + ... + 9627039660.

Almost surely, 2^{21025452233604} is an apocalyptic number.

It is an amenable number.

21025452233604 is an abundant number, since it is smaller than the sum of its proper divisors (39355333671164).

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

21025452233604 is a wasteful number, since it uses less digits than its factorization.

21025452233604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19254077164 (or 19254077162 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 39.

Adding to 21025452233604 its reverse (40633225452012), we get a palindrome (61658677685616).

The spelling of 21025452233604 in words is "twenty-one trillion, twenty-five billion, four hundred fifty-two million, two hundred thirty-three thousand, six hundred four".