21223985172307 has 4 divisors (see below), whose sum is σ = 21430043280880. Its totient is φ = 21017927063736.

The previous prime is 21223985172263. The next prime is 21223985172331. The reversal of 21223985172307 is 70327158932212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21223985172307 - 2³¹ = 21221837688659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223985172407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103029054132 + ... + 103029054337.

It is an arithmetic number, because the mean of its divisors is an integer number (5357510820220).

Almost surely, 2^{21223985172307} is an apocalyptic number.

21223985172307 is a deficient number, since it is larger than the sum of its proper divisors (206058108573).

21223985172307 is a wasteful number, since it uses less digits than its factorization.

21223985172307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206058108572.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 21223985172307 in words is "twenty-one trillion, two hundred twenty-three billion, nine hundred eighty-five million, one hundred seventy-two thousand, three hundred seven".