21872437189390 has 32 divisors (see below), whose sum is σ = 40332548168640. Its totient is φ = 8535181459200.

The previous prime is 21872437189297. The next prime is 21872437189409. The reversal of 21872437189390 is 9398173427812.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7489620 + ... + 9991960.

It is an arithmetic number, because the mean of its divisors is an integer number (1260392130270).

Almost surely, 2^{21872437189390} is an apocalyptic number.

21872437189390 is a deficient number, since it is larger than the sum of its proper divisors (18460110979250).

21872437189390 is a wasteful number, since it uses less digits than its factorization.

21872437189390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523708.

The product of its (nonzero) digits is 36578304, while the sum is 64.

The spelling of 21872437189390 in words is "twenty-one trillion, eight hundred seventy-two billion, four hundred thirty-seven million, one hundred eighty-nine thousand, three hundred ninety".