21141938772 has 36 divisors (see below), whose sum is σ = 53524781856. Its totient is φ = 7036412880.

The previous prime is 21141938771. The next prime is 21141938801. The reversal of 21141938772 is 27783914112.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21141938771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 430554 + ... + 477137.

It is an arithmetic number, because the mean of its divisors is an integer number (1486799496).

Almost surely, 2^21141938772 is an apocalyptic number.

It is an amenable number.

21141938772 is an abundant number, since it is smaller than the sum of its proper divisors (32382843084).

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

21141938772 is a wasteful number, since it uses less digits than its factorization.

21141938772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908348 (or 908343 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The spelling of 21141938772 in words is "twenty-one billion, one hundred forty-one million, nine hundred thirty-eight thousand, seven hundred seventy-two".