22001279 has 4 divisors (see below), whose sum is σ = 22080984. Its totient is φ = 21921576.

The previous prime is 22001261. The next prime is 22001303. The reversal of 22001279 is 97210022.

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 22001279 - 2¹⁶ = 21935743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001209) 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, 39437 + ... + 39990.

It is an arithmetic number, because the mean of its divisors is an integer number (5520246).

Almost surely, 2^22001279 is an apocalyptic number.

22001279 is a deficient number, since it is larger than the sum of its proper divisors (79705).

22001279 is an equidigital number, since it uses as much as digits as its factorization.

22001279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79704.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 22001279 is about 4690.5520997000. The cubic root of 22001279 is about 280.2093629729.

The spelling of 22001279 in words is "twenty-two million, one thousand, two hundred seventy-nine".