21790235512 has 32 divisors (see below), whose sum is σ = 42646538880. Its totient is φ = 10418124640.

The previous prime is 21790235501. The next prime is 21790235531. The reversal of 21790235512 is 21553209712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625383 + ... + 659305.

It is an arithmetic number, because the mean of its divisors is an integer number (1332704340).

Almost surely, 2^21790235512 is an apocalyptic number.

It is an amenable number.

21790235512 is a deficient number, since it is larger than the sum of its proper divisors (20856303368).

21790235512 is a wasteful number, since it uses less digits than its factorization.

21790235512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37443 (or 37439 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 21790235512 in words is "twenty-one billion, seven hundred ninety million, two hundred thirty-five thousand, five hundred twelve".