21641090379 has 16 divisors (see below), whose sum is σ = 30115392000. Its totient is φ = 13797343296.

The previous prime is 21641090309. The next prime is 21641090411. The reversal of 21641090379 is 97309014612.

It is not a de Polignac number, because 21641090379 - 2²³ = 21632701771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21641090379.

It is not an unprimeable number, because it can be changed into a prime (21641090309) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 347202 + ... + 404760.

It is an arithmetic number, because the mean of its divisors is an integer number (1882212000).

Almost surely, 2^21641090379 is an apocalyptic number.

21641090379 is a deficient number, since it is larger than the sum of its proper divisors (8474301621).

21641090379 is a wasteful number, since it uses less digits than its factorization.

21641090379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63034.

The product of its (nonzero) digits is 81648, while the sum is 42.

The spelling of 21641090379 in words is "twenty-one billion, six hundred forty-one million, ninety thousand, three hundred seventy-nine".