21692026 has 4 divisors (see below), whose sum is σ = 32538042. Its totient is φ = 10846012.

The previous prime is 21691979. The next prime is 21692063. The reversal of 21692026 is 62029612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21390625 + 301401 = 4625^2 + 549^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21691985 and 21692003.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5423005 + ... + 5423008.

Almost surely, 2^21692026 is an apocalyptic number.

21692026 is a deficient number, since it is larger than the sum of its proper divisors (10846016).

21692026 is a wasteful number, since it uses less digits than its factorization.

21692026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10846015.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 21692026 is about 4657.4699140198. The cubic root of 21692026 is about 278.8902760087.

The spelling of 21692026 in words is "twenty-one million, six hundred ninety-two thousand, twenty-six".