21253432332624 has 80 divisors (see below), whose sum is σ = 55235630443392. Its totient is φ = 7041780089344.

The previous prime is 21253432332599. The next prime is 21253432332641. The reversal of 21253432332624 is 42623323435212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367849402 + ... + 367907174.

Almost surely, 2^{21253432332624} is an apocalyptic number.

21253432332624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21253432332624 is an abundant number, since it is smaller than the sum of its proper divisors (33982198110768).

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

21253432332624 is a wasteful number, since it uses less digits than its factorization.

21253432332624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103844 (or 103838 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 42.

Adding to 21253432332624 its reverse (42623323435212), we get a palindrome (63876755767836).

The spelling of 21253432332624 in words is "twenty-one trillion, two hundred fifty-three billion, four hundred thirty-two million, three hundred thirty-two thousand, six hundred twenty-four".