21222274664 has 32 divisors (see below), whose sum is σ = 39927162600. Its totient is φ = 10575079680.

The previous prime is 21222274657. The next prime is 21222274669. The reversal of 21222274664 is 46647222212.

It can be written as a sum of positive squares in 4 ways, for example, as 11565281764 + 9656992900 = 107542^2 + 98270^2 .

It is not an unprimeable number, because it can be changed into a prime (21222274669) 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 7 ways as a sum of consecutive naturals, for example, 5416034 + ... + 5419950.

Almost surely, 2^21222274664 is an apocalyptic number.

It is an amenable number.

21222274664 is a deficient number, since it is larger than the sum of its proper divisors (18704887936).

21222274664 is a wasteful number, since it uses less digits than its factorization.

21222274664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6053 (or 6049 counting only the distinct ones).

The product of its digits is 129024, while the sum is 38.

Adding to 21222274664 its reverse (46647222212), we get a palindrome (67869496876).

The spelling of 21222274664 in words is "twenty-one billion, two hundred twenty-two million, two hundred seventy-four thousand, six hundred sixty-four".