22021993 has 8 divisors (see below), whose sum is σ = 25848512. Its totient is φ = 18365616.

The previous prime is 22021981. The next prime is 22022009. The reversal of 22021993 is 39912022.

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

It is not a de Polignac number, because 22021993 - 2²¹ = 19924841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22021903) 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, 42255 + ... + 42772.

It is an arithmetic number, because the mean of its divisors is an integer number (3231064).

Almost surely, 2^22021993 is an apocalyptic number.

It is an amenable number.

22021993 is a deficient number, since it is larger than the sum of its proper divisors (3826519).

22021993 is an equidigital number, since it uses as much as digits as its factorization.

22021993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85071.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 22021993 is about 4692.7596358646. The cubic root of 22021993 is about 280.2972735613.

The spelling of 22021993 in words is "twenty-two million, twenty-one thousand, nine hundred ninety-three".