22143381 has 8 divisors (see below), whose sum is σ = 31795680. Its totient is φ = 13626672.

The previous prime is 22143371. The next prime is 22143383. The reversal of 22143381 is 18334122.

Added to its reverse (18334122) it gives a triangular number (40477503 = T₈₉₉₇).

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

It is not a de Polignac number, because 22143381 - 2¹³ = 22135189 is a prime.

It is a super-2 number, since 2×22143381² = 980658644222322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22143383) 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, 283851 + ... + 283928.

It is an arithmetic number, because the mean of its divisors is an integer number (3974460).

Almost surely, 2^22143381 is an apocalyptic number.

It is an amenable number.

22143381 is a deficient number, since it is larger than the sum of its proper divisors (9652299).

22143381 is a wasteful number, since it uses less digits than its factorization.

22143381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567795.

The product of its digits is 1152, while the sum is 24.

The square root of 22143381 is about 4705.6754031701. The cubic root of 22143381 is about 280.8113414750.

Adding to 22143381 its reverse (18334122), we get a triangular number (40477503 = T₈₉₉₇).

The spelling of 22143381 in words is "twenty-two million, one hundred forty-three thousand, three hundred eighty-one".