21090322512 has 400 divisors, whose sum is σ = 74032856832. Its totient is φ = 5665904640.

The previous prime is 21090322501. The next prime is 21090322559. The reversal of 21090322512 is 21522309012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 12727188 + ... + 12728844.

Almost surely, 2^21090322512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21090322512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37016428416).

21090322512 is an abundant number, since it is smaller than the sum of its proper divisors (52942534320).

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

21090322512 is a wasteful number, since it uses less digits than its factorization.

21090322512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768 (or 1753 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 21090322512 in words is "twenty-one billion, ninety million, three hundred twenty-two thousand, five hundred twelve".