21047631171844 has 48 divisors (see below), whose sum is σ = 40616624160000. Its totient is φ = 9504289896192.

The previous prime is 21047631171803. The next prime is 21047631171857. The reversal of 21047631171844 is 44817113674012.

It is a happy number.

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, 60267289 + ... + 60615520.

It is an arithmetic number, because the mean of its divisors is an integer number (846179670000).

Almost surely, 2^{21047631171844} is an apocalyptic number.

It is an amenable number.

21047631171844 is a deficient number, since it is larger than the sum of its proper divisors (19568992988156).

21047631171844 is a wasteful number, since it uses less digits than its factorization.

21047631171844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120882940 (or 120882938 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 49.

The spelling of 21047631171844 in words is "twenty-one trillion, forty-seven billion, six hundred thirty-one million, one hundred seventy-one thousand, eight hundred forty-four".