21039510944 has 24 divisors (see below), whose sum is σ = 41437122048. Its totient is φ = 10515797440.

The previous prime is 21039510941. The next prime is 21039510953. The reversal of 21039510944 is 44901593012.

It is a super-2 number, since 2×21039510944² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21039510898 and 21039510907.

It is not an unprimeable number, because it can be changed into a prime (21039510941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36362 + ... + 208329.

It is an arithmetic number, because the mean of its divisors is an integer number (1726546752).

Almost surely, 2^21039510944 is an apocalyptic number.

It is an amenable number.

21039510944 is a deficient number, since it is larger than the sum of its proper divisors (20397611104).

21039510944 is a wasteful number, since it uses less digits than its factorization.

21039510944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247388 (or 247380 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 21039510944 in words is "twenty-one billion, thirty-nine million, five hundred ten thousand, nine hundred forty-four".