21960563838 has 16 divisors (see below), whose sum is σ = 45435649680. Its totient is φ = 7067767616.

The previous prime is 21960563819. The next prime is 21960563839. The reversal of 21960563838 is 83836506912.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21960563839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63104895 + ... + 63105242.

It is an arithmetic number, because the mean of its divisors is an integer number (2839728105).

Almost surely, 2^21960563838 is an apocalyptic number.

21960563838 is an abundant number, since it is smaller than the sum of its proper divisors (23475085842).

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

21960563838 is a wasteful number, since it uses less digits than its factorization.

21960563838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126210171.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 21960563838 in words is "twenty-one billion, nine hundred sixty million, five hundred sixty-three thousand, eight hundred thirty-eight".