22137381 has 20 divisors (see below), whose sum is σ = 37794592. Its totient is φ = 12649608.

The previous prime is 22137371. The next prime is 22137391. The reversal of 22137381 is 18373122.

It is an interprime number because it is at equal distance from previous prime (22137371) and next prime (22137391).

It is not a de Polignac number, because 22137381 - 2⁹ = 22136869 is a prime.

It is a super-2 number, since 2×22137381² = 980127275078322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22137341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18955 + ... + 20088.

Almost surely, 2^22137381 is an apocalyptic number.

22137381 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22137381 is a deficient number, since it is larger than the sum of its proper divisors (15657211).

22137381 is an equidigital number, since it uses as much as digits as its factorization.

22137381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39062 (or 39053 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 22137381 is about 4705.0378319414. The cubic root of 22137381 is about 280.7859761789.

The spelling of 22137381 in words is "twenty-two million, one hundred thirty-seven thousand, three hundred eighty-one".