21076222566 has 32 divisors (see below), whose sum is σ = 51008002560. Its totient is φ = 5667555456.

The previous prime is 21076222547. The next prime is 21076222567. The reversal of 21076222566 is 66522267012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21076222567) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 14758546 + ... + 14759973.

It is an arithmetic number, because the mean of its divisors is an integer number (1594000080).

Almost surely, 2^21076222566 is an apocalyptic number.

21076222566 is an abundant number, since it is smaller than the sum of its proper divisors (29931779994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21076222566 is a wasteful number, since it uses less digits than its factorization.

21076222566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29518548.

The product of its (nonzero) digits is 120960, while the sum is 39.

Adding to 21076222566 its reverse (66522267012), we get a palindrome (87598489578).

The spelling of 21076222566 in words is "twenty-one billion, seventy-six million, two hundred twenty-two thousand, five hundred sixty-six".