21213612324604 has 48 divisors (see below), whose sum is σ = 42823314293760. Its totient is φ = 9006698473920.

The previous prime is 21213612324601. The next prime is 21213612324613. The reversal of 21213612324604 is 40642321631212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213612324601) 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, 18635139 + ... + 19740709.

It is an arithmetic number, because the mean of its divisors is an integer number (892152381120).

Almost surely, 2^{21213612324604} is an apocalyptic number.

It is an amenable number.

21213612324604 is an abundant number, since it is smaller than the sum of its proper divisors (21609701969156).

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

21213612324604 is a wasteful number, since it uses less digits than its factorization.

21213612324604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111978 (or 1111976 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

Adding to 21213612324604 its reverse (40642321631212), we get a palindrome (61855933955816).

The spelling of 21213612324604 in words is "twenty-one trillion, two hundred thirteen billion, six hundred twelve million, three hundred twenty-four thousand, six hundred four".