21879201844 has 24 divisors (see below), whose sum is σ = 39639852000. Its totient is φ = 10554119520.

The previous prime is 21879201809. The next prime is 21879201847. The reversal of 21879201844 is 44810297812.

It is a junction number, because it is equal to n+sod(n) for n = 21879201794 and 21879201803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21879201847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76707 + ... + 222805.

It is an arithmetic number, because the mean of its divisors is an integer number (1651660500).

Almost surely, 2^21879201844 is an apocalyptic number.

It is an amenable number.

21879201844 is a deficient number, since it is larger than the sum of its proper divisors (17760650156).

21879201844 is a wasteful number, since it uses less digits than its factorization.

21879201844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147423 (or 147421 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 21879201844 in words is "twenty-one billion, eight hundred seventy-nine million, two hundred one thousand, eight hundred forty-four".