21223177707 has 16 divisors (see below), whose sum is σ = 30076117760. Its totient is φ = 13273971552.

The previous prime is 21223177699. The next prime is 21223177709. The reversal of 21223177707 is 70777132212.

It is a happy number.

It is not a de Polignac number, because 21223177707 - 2³ = 21223177699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223177709) 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, 1801588 + ... + 1813329.

It is an arithmetic number, because the mean of its divisors is an integer number (1879757360).

Almost surely, 2^21223177707 is an apocalyptic number.

21223177707 is a deficient number, since it is larger than the sum of its proper divisors (8852940053).

21223177707 is a wasteful number, since it uses less digits than its factorization.

21223177707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3615042.

The product of its (nonzero) digits is 57624, while the sum is 39.

The spelling of 21223177707 in words is "twenty-one billion, two hundred twenty-three million, one hundred seventy-seven thousand, seven hundred seven".