21412520413438 has 32 divisors (see below), whose sum is σ = 42151783184640. Its totient is φ = 7903459344960.

The previous prime is 21412520413399. The next prime is 21412520413463. The reversal of 21412520413438 is 83431402521412.

It is a self number, because there is not a number n which added to its sum of digits gives 21412520413438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3659006031 + ... + 3659011882.

It is an arithmetic number, because the mean of its divisors is an integer number (1317243224520).

Almost surely, 2^{21412520413438} is an apocalyptic number.

21412520413438 is a deficient number, since it is larger than the sum of its proper divisors (20739262771202).

21412520413438 is a wasteful number, since it uses less digits than its factorization.

21412520413438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7318017952.

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 21412520413438 in words is "twenty-one trillion, four hundred twelve billion, five hundred twenty million, four hundred thirteen thousand, four hundred thirty-eight".