21879098826 has 32 divisors (see below), whose sum is σ = 47260075968. Its totient is φ = 6712621440.

The previous prime is 21879098803. The next prime is 21879098851. The reversal of 21879098826 is 62889097812.

It is a self number, because there is not a number n which added to its sum of digits gives 21879098826.

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, 377115 + ... + 431246.

It is an arithmetic number, because the mean of its divisors is an integer number (1476877374).

Almost surely, 2^21879098826 is an apocalyptic number.

21879098826 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21879098826 is an abundant number, since it is smaller than the sum of its proper divisors (25380977142).

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

21879098826 is a wasteful number, since it uses less digits than its factorization.

21879098826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808726.

The product of its (nonzero) digits is 6967296, while the sum is 60.

The spelling of 21879098826 in words is "twenty-one billion, eight hundred seventy-nine million, ninety-eight thousand, eight hundred twenty-six".