21512530022 has 4 divisors (see below), whose sum is σ = 32268795036. Its totient is φ = 10756265010.

The previous prime is 21512530021. The next prime is 21512530033. The reversal of 21512530022 is 22003521512.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21512530022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21512530021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5378132504 + ... + 5378132507.

It is an arithmetic number, because the mean of its divisors is an integer number (8067198759).

Almost surely, 2^21512530022 is an apocalyptic number.

21512530022 is a deficient number, since it is larger than the sum of its proper divisors (10756265014).

21512530022 is a wasteful number, since it uses less digits than its factorization.

21512530022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10756265013.

The product of its (nonzero) digits is 1200, while the sum is 23.

The spelling of 21512530022 in words is "twenty-one billion, five hundred twelve million, five hundred thirty thousand, twenty-two".