22101381 has 12 divisors (see below), whose sum is σ = 31968300. Its totient is φ = 14713920.

The previous prime is 22101349. The next prime is 22101433. The reversal of 22101381 is 18310122.

It can be written as a sum of positive squares in 2 ways, for example, as 17564481 + 4536900 = 4191^2 + 2130^2 .

It is not a de Polignac number, because 22101381 - 2⁵ = 22101349 is a prime.

It is a super-2 number, since 2×22101381² = 976942084214322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8271 + ... + 10611.

It is an arithmetic number, because the mean of its divisors is an integer number (2664025).

Almost surely, 2^22101381 is an apocalyptic number.

It is an amenable number.

22101381 is a deficient number, since it is larger than the sum of its proper divisors (9866919).

22101381 is a wasteful number, since it uses less digits than its factorization.

22101381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396 (or 3393 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 22101381 is about 4701.2105887739. The cubic root of 22101381 is about 280.6336880725.

The spelling of 22101381 in words is "twenty-two million, one hundred one thousand, three hundred eighty-one".