23221768221851 has 4 divisors (see below), whose sum is σ = 23715848396832. Its totient is φ = 22727688046872.

The previous prime is 23221768221833. The next prime is 23221768221853. The reversal of 23221768221851 is 15812286712232.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23221768221851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23221768221851.

It is not an unprimeable number, because it can be changed into a prime (23221768221853) 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, 247040087420 + ... + 247040087513.

It is an arithmetic number, because the mean of its divisors is an integer number (5928962099208).

Almost surely, 2^{23221768221851} is an apocalyptic number.

23221768221851 is a deficient number, since it is larger than the sum of its proper divisors (494080174981).

23221768221851 is an equidigital number, since it uses as much as digits as its factorization.

23221768221851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494080174980.

The product of its digits is 1290240, while the sum is 50.

The spelling of 23221768221851 in words is "twenty-three trillion, two hundred twenty-one billion, seven hundred sixty-eight million, two hundred twenty-one thousand, eight hundred fifty-one".