21975863002 has 16 divisors (see below), whose sum is σ = 33414006600. Its totient is φ = 10838670400.

The previous prime is 21975862981. The next prime is 21975863003. The reversal of 21975863002 is 20036857912.

It can be written as a sum of positive squares in 4 ways, for example, as 20079173401 + 1896689601 = 141701^2 + 43551^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21975863002.

It is not an unprimeable number, because it can be changed into a prime (21975863003) 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, 147877 + ... + 256552.

Almost surely, 2^21975863002 is an apocalyptic number.

21975863002 is a deficient number, since it is larger than the sum of its proper divisors (11438143598).

21975863002 is a wasteful number, since it uses less digits than its factorization.

21975863002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404801.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 21975863002 in words is "twenty-one billion, nine hundred seventy-five million, eight hundred sixty-three thousand, two".