21970496528 has 20 divisors (see below), whose sum is σ = 42587897340. Its totient is φ = 10980071424.

The previous prime is 21970496521. The next prime is 21970496543. The reversal of 21970496528 is 82569407912.

It can be written as a sum of positive squares in 2 ways, for example, as 9221376784 + 12749119744 = 96028^2 + 112912^2 .

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21970496528.

It is not an unprimeable number, because it can be changed into a prime (21970496521) 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, 288425 + ... + 356552.

It is an arithmetic number, because the mean of its divisors is an integer number (2129394867).

Almost surely, 2^21970496528 is an apocalyptic number.

It is an amenable number.

21970496528 is a deficient number, since it is larger than the sum of its proper divisors (20617400812).

21970496528 is a wasteful number, since it uses less digits than its factorization.

21970496528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647114 (or 647108 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 21970496528 in words is "twenty-one billion, nine hundred seventy million, four hundred ninety-six thousand, five hundred twenty-eight".