21765532522 has 8 divisors (see below), whose sum is σ = 32971549572. Its totient is φ = 10775016000.

The previous prime is 21765532513. The next prime is 21765532567. The reversal of 21765532522 is 22523556712.

It can be written as a sum of positive squares in 2 ways, for example, as 18672949201 + 3092583321 = 136649^2 + 55611^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 53874879 + ... + 53875282.

Almost surely, 2^21765532522 is an apocalyptic number.

21765532522 is a deficient number, since it is larger than the sum of its proper divisors (11206017050).

21765532522 is a wasteful number, since it uses less digits than its factorization.

21765532522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107750264.

The product of its digits is 252000, while the sum is 40.

The spelling of 21765532522 in words is "twenty-one billion, seven hundred sixty-five million, five hundred thirty-two thousand, five hundred twenty-two".