21612231456004 has 48 divisors (see below), whose sum is σ = 43774260006400. Its totient is φ = 9144585455616.

The previous prime is 21612231455981. The next prime is 21612231456007. The reversal of 21612231456004 is 40065413221612.

It is not an unprimeable number, because it can be changed into a prime (21612231456007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37301032 + ... + 37876000.

Almost surely, 2^{21612231456004} is an apocalyptic number.

It is an amenable number.

21612231456004 is an abundant number, since it is smaller than the sum of its proper divisors (22162028550396).

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

21612231456004 is a wasteful number, since it uses less digits than its factorization.

21612231456004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592052 (or 592050 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

Adding to 21612231456004 its reverse (40065413221612), we get a palindrome (61677644677616).

The spelling of 21612231456004 in words is "twenty-one trillion, six hundred twelve billion, two hundred thirty-one million, four hundred fifty-six thousand, four".