22131645 has 8 divisors (see below), whose sum is σ = 35410656. Its totient is φ = 11803536.

The previous prime is 22131643. The next prime is 22131647. The reversal of 22131645 is 54613122.

It is an interprime number because it is at equal distance from previous prime (22131643) and next prime (22131647).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22131645 - 2¹ = 22131643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737707 + ... + 737736.

It is an arithmetic number, because the mean of its divisors is an integer number (4426332).

Almost surely, 2^22131645 is an apocalyptic number.

It is an amenable number.

22131645 is a deficient number, since it is larger than the sum of its proper divisors (13279011).

22131645 is a wasteful number, since it uses less digits than its factorization.

22131645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475451.

The product of its digits is 1440, while the sum is 24.

The square root of 22131645 is about 4704.4282330587. The cubic root of 22131645 is about 280.7617226702.

Adding to 22131645 its reverse (54613122), we get a palindrome (76744767).

The spelling of 22131645 in words is "twenty-two million, one hundred thirty-one thousand, six hundred forty-five".