22172071 has 4 divisors (see below), whose sum is σ = 22475872. Its totient is φ = 21868272.

The previous prime is 22172057. The next prime is 22172077. The reversal of 22172071 is 17027122.

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 22172071 - 2⁹ = 22171559 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 (22172077) 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, 151791 + ... + 151936.

It is an arithmetic number, because the mean of its divisors is an integer number (5618968).

Almost surely, 2^22172071 is an apocalyptic number.

22172071 is a deficient number, since it is larger than the sum of its proper divisors (303801).

22172071 is an equidigital number, since it uses as much as digits as its factorization.

22172071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303800.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 22172071 is about 4708.7228629428. The cubic root of 22172071 is about 280.9325665707.

Adding to 22172071 its reverse (17027122), we get a palindrome (39199193).

The spelling of 22172071 in words is "twenty-two million, one hundred seventy-two thousand, seventy-one".