22157819 has 6 divisors (see below), whose sum is σ = 23385780. Its totient is φ = 20991276.

The previous prime is 22157797. The next prime is 22157867. The reversal of 22157819 is 91875122.

It is not a de Polignac number, because 22157819 - 2¹² = 22153723 is a prime.

It is a super-2 number, since 2×22157819² = 981937885673522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22157879) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30329 + ... + 31050.

It is an arithmetic number, because the mean of its divisors is an integer number (3897630).

Almost surely, 2^22157819 is an apocalyptic number.

22157819 is a deficient number, since it is larger than the sum of its proper divisors (1227961).

22157819 is an equidigital number, since it uses as much as digits as its factorization.

22157819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61417 (or 61398 counting only the distinct ones).

The product of its digits is 10080, while the sum is 35.

The square root of 22157819 is about 4707.2092581486. The cubic root of 22157819 is about 280.8723600594.

The spelling of 22157819 in words is "twenty-two million, one hundred fifty-seven thousand, eight hundred nineteen".