21253212052604 has 24 divisors (see below), whose sum is σ = 42675772422528. Its totient is φ = 9072230526000.

The previous prime is 21253212052603. The next prime is 21253212052613. The reversal of 21253212052604 is 40625021235212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253212052603) 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 7 ways as a sum of consecutive naturals, for example, 1512031394 + ... + 1512045449.

It is an arithmetic number, because the mean of its divisors is an integer number (1778157184272).

Almost surely, 2^{21253212052604} is an apocalyptic number.

It is an amenable number.

21253212052604 is an abundant number, since it is smaller than the sum of its proper divisors (21422560369924).

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

21253212052604 is a wasteful number, since it uses less digits than its factorization.

21253212052604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3024077105 (or 3024077103 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 21253212052604 its reverse (40625021235212), we get a palindrome (61878233287816).

The spelling of 21253212052604 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred twelve million, fifty-two thousand, six hundred four".