22371661 has 4 divisors (see below), whose sum is σ = 24092572. Its totient is φ = 20650752.

The previous prime is 22371649. The next prime is 22371719. The reversal of 22371661 is 16617322.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9548100 + 12823561 = 3090^2 + 3581^2 .

It is a cyclic number.

It is not a de Polignac number, because 22371661 - 2⁷ = 22371533 is a prime.

It is a super-3 number, since 3×22371661³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22371611) 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, 860436 + ... + 860461.

It is an arithmetic number, because the mean of its divisors is an integer number (6023143).

Almost surely, 2^22371661 is an apocalyptic number.

It is an amenable number.

22371661 is a deficient number, since it is larger than the sum of its proper divisors (1720911).

22371661 is a wasteful number, since it uses less digits than its factorization.

22371661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720910.

The product of its digits is 3024, while the sum is 28.

The square root of 22371661 is about 4729.8690256708. The cubic root of 22371661 is about 281.7730220925.

Adding to 22371661 its reverse (16617322), we get a palindrome (38988983).

It can be divided in two parts, 22371 and 661, that added together give a palindrome (23032).

The spelling of 22371661 in words is "twenty-two million, three hundred seventy-one thousand, six hundred sixty-one".