21227967639 has 6 divisors (see below), whose sum is σ = 30662619936. Its totient is φ = 14151978420.

The previous prime is 21227967601. The next prime is 21227967671. The reversal of 21227967639 is 93676972212.

It is not a de Polignac number, because 21227967639 - 2⁷ = 21227967511 is a prime.

It is a super-2 number, since 2×21227967639² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227967539) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1179331527 + ... + 1179331544.

It is an arithmetic number, because the mean of its divisors is an integer number (5110436656).

Almost surely, 2^21227967639 is an apocalyptic number.

21227967639 is a deficient number, since it is larger than the sum of its proper divisors (9434652297).

21227967639 is a wasteful number, since it uses less digits than its factorization.

21227967639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358663077 (or 2358663074 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The spelling of 21227967639 in words is "twenty-one billion, two hundred twenty-seven million, nine hundred sixty-seven thousand, six hundred thirty-nine".