21842692 has 12 divisors (see below), whose sum is σ = 38362716. Its totient is φ = 10881920.

The previous prime is 21842683. The next prime is 21842699. The reversal of 21842692 is 29624812.

It can be written as a sum of positive squares in 2 ways, for example, as 7584516 + 14258176 = 2754^2 + 3776^2 .

It is not an unprimeable number, because it can be changed into a prime (21842699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8593 + ... + 10840.

It is an arithmetic number, because the mean of its divisors is an integer number (3196893).

Almost surely, 2^21842692 is an apocalyptic number.

It is an amenable number.

21842692 is a deficient number, since it is larger than the sum of its proper divisors (16520024).

21842692 is a wasteful number, since it uses less digits than its factorization.

21842692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19718 (or 19716 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 21842692 is about 4673.6165867559. The cubic root of 21842692 is about 279.5344815759.

The spelling of 21842692 in words is "twenty-one million, eight hundred forty-two thousand, six hundred ninety-two".