21227715634 has 16 divisors (see below), whose sum is σ = 33348614400. Its totient is φ = 10114917120.

The previous prime is 21227715571. The next prime is 21227715643. The reversal of 21227715634 is 43651772212.

It is a super-2 number, since 2×21227715634² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 838959 + ... + 863890.

It is an arithmetic number, because the mean of its divisors is an integer number (2084288400).

Almost surely, 2^21227715634 is an apocalyptic number.

21227715634 is a deficient number, since it is larger than the sum of its proper divisors (12120898766).

21227715634 is a wasteful number, since it uses less digits than its factorization.

21227715634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703145.

The product of its digits is 141120, while the sum is 40.

The spelling of 21227715634 in words is "twenty-one billion, two hundred twenty-seven million, seven hundred fifteen thousand, six hundred thirty-four".