21211212441204 has 72 divisors (see below), whose sum is σ = 53639738122880. Its totient is φ = 7067436976512.

The previous prime is 21211212441203. The next prime is 21211212441229. The reversal of 21211212441204 is 40214421211212.

21211212441204 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 1 + 2 + 12 + 441 + 204 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211212441203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1055851992 + ... + 1055872080.

Almost surely, 2^{21211212441204} is an apocalyptic number.

It is an amenable number.

21211212441204 is an abundant number, since it is smaller than the sum of its proper divisors (32428525681676).

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

21211212441204 is a wasteful number, since it uses less digits than its factorization.

21211212441204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30949 (or 30944 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

Adding to 21211212441204 its reverse (40214421211212), we get a palindrome (61425633652416).

The spelling of 21211212441204 in words is "twenty-one trillion, two hundred eleven billion, two hundred twelve million, four hundred forty-one thousand, two hundred four".