21006626223 has 16 divisors (see below), whose sum is σ = 30620543616. Its totient is φ = 12704017440.

The previous prime is 21006626183. The next prime is 21006626231. The reversal of 21006626223 is 32262660012.

It is not a de Polignac number, because 21006626223 - 2⁶ = 21006626159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21006636223) 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, 666136 + ... + 696957.

It is an arithmetic number, because the mean of its divisors is an integer number (1913783976).

Almost surely, 2^21006626223 is an apocalyptic number.

21006626223 is a deficient number, since it is larger than the sum of its proper divisors (9613917393).

21006626223 is a wasteful number, since it uses less digits than its factorization.

21006626223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363574.

The product of its (nonzero) digits is 10368, while the sum is 30.

The spelling of 21006626223 in words is "twenty-one billion, six million, six hundred twenty-six thousand, two hundred twenty-three".