21223331679 has 16 divisors (see below), whose sum is σ = 31588216704. Its totient is φ = 12563493600.

The previous prime is 21223331671. The next prime is 21223331681. The reversal of 21223331679 is 97613332212.

It is not a de Polignac number, because 21223331679 - 2³ = 21223331671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223331671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7476852 + ... + 7479689.

It is an arithmetic number, because the mean of its divisors is an integer number (1974263544).

Almost surely, 2^21223331679 is an apocalyptic number.

21223331679 is a deficient number, since it is larger than the sum of its proper divisors (10364885025).

21223331679 is a wasteful number, since it uses less digits than its factorization.

21223331679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14956598.

The product of its digits is 81648, while the sum is 39.

The spelling of 21223331679 in words is "twenty-one billion, two hundred twenty-three million, three hundred thirty-one thousand, six hundred seventy-nine".