21141879390 has 64 divisors (see below), whose sum is σ = 56401773120. Its totient is φ = 5635491840.

The previous prime is 21141879373. The next prime is 21141879397. The reversal of 21141879390 is 9397814112.

21141879390 is a `hidden beast` number, since 211 + 41 + 8 + 7 + 9 + 390 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21141879397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 691630 + ... + 721550.

It is an arithmetic number, because the mean of its divisors is an integer number (881277705).

Almost surely, 2^21141879390 is an apocalyptic number.

21141879390 is an abundant number, since it is smaller than the sum of its proper divisors (35259893730).

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

21141879390 is a wasteful number, since it uses less digits than its factorization.

21141879390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32554 (or 32548 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 21141879390 in words is "twenty-one billion, one hundred forty-one million, eight hundred seventy-nine thousand, three hundred ninety".