21799194 has 32 divisors (see below), whose sum is σ = 46970880. Its totient is φ = 6722352.

The previous prime is 21799189. The next prime is 21799199. The reversal of 21799194 is 49199712.

It is an interprime number because it is at equal distance from previous prime (21799189) and next prime (21799199).

It is not an unprimeable number, because it can be changed into a prime (21799199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2679 + ... + 7125.

It is an arithmetic number, because the mean of its divisors is an integer number (1467840).

Almost surely, 2^21799194 is an apocalyptic number.

21799194 is an abundant number, since it is smaller than the sum of its proper divisors (25171686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21799194 is a wasteful number, since it uses less digits than its factorization.

21799194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4514.

The product of its digits is 40824, while the sum is 42.

The square root of 21799194 is about 4668.9606980569. The cubic root of 21799194 is about 279.3488013009.

The spelling of 21799194 in words is "twenty-one million, seven hundred ninety-nine thousand, one hundred ninety-four".