22371981 has 8 divisors (see below), whose sum is σ = 29984640. Its totient is φ = 14836992.

The previous prime is 22371977. The next prime is 22372001. The reversal of 22371981 is 18917322.

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

It is not a de Polignac number, because 22371981 - 2² = 22371977 is a prime.

It is a super-2 number, since 2×22371981² = 1001011067728722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22371941) 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, 18741 + ... + 19898.

It is an arithmetic number, because the mean of its divisors is an integer number (3748080).

Almost surely, 2^22371981 is an apocalyptic number.

It is an amenable number.

22371981 is a deficient number, since it is larger than the sum of its proper divisors (7612659).

22371981 is a wasteful number, since it uses less digits than its factorization.

22371981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38835.

The product of its digits is 6048, while the sum is 33.

The square root of 22371981 is about 4729.9028531250. The cubic root of 22371981 is about 281.7743655620.

The spelling of 22371981 in words is "twenty-two million, three hundred seventy-one thousand, nine hundred eighty-one".