22071391 has 4 divisors (see below), whose sum is σ = 22166352. Its totient is φ = 21976432.

The previous prime is 22071383. The next prime is 22071403. The reversal of 22071391 is 19317022.

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 22071391 - 2³ = 22071383 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 (22071311) 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, 47131 + ... + 47596.

It is an arithmetic number, because the mean of its divisors is an integer number (5541588).

Almost surely, 2^22071391 is an apocalyptic number.

22071391 is a deficient number, since it is larger than the sum of its proper divisors (94961).

22071391 is an equidigital number, since it uses as much as digits as its factorization.

22071391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94960.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 22071391 is about 4698.0199020438. The cubic root of 22071391 is about 280.5066973065.

The spelling of 22071391 in words is "twenty-two million, seventy-one thousand, three hundred ninety-one".