21975322802 has 4 divisors (see below), whose sum is σ = 32962984206. Its totient is φ = 10987661400.

The previous prime is 21975322757. The next prime is 21975322823. The reversal of 21975322802 is 20822357912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19759643761 + 2215679041 = 140569^2 + 47071^2 .

It is a super-2 number, since 2×21975322802² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21975322802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5493830699 + ... + 5493830702.

Almost surely, 2^21975322802 is an apocalyptic number.

21975322802 is a deficient number, since it is larger than the sum of its proper divisors (10987661404).

21975322802 is a wasteful number, since it uses less digits than its factorization.

21975322802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10987661403.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 21975322802 in words is "twenty-one billion, nine hundred seventy-five million, three hundred twenty-two thousand, eight hundred two".