21292994 has 8 divisors (see below), whose sum is σ = 32154300. Its totient is φ = 10574896.

The previous prime is 21292979. The next prime is 21293003. The reversal of 21292994 is 49929212.

It can be written as a sum of positive squares in 2 ways, for example, as 21279769 + 13225 = 4613^2 + 115^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35429 + ... + 36024.

Almost surely, 2^21292994 is an apocalyptic number.

21292994 is a deficient number, since it is larger than the sum of its proper divisors (10861306).

21292994 is a wasteful number, since it uses less digits than its factorization.

21292994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71604.

The product of its digits is 23328, while the sum is 38.

The square root of 21292994 is about 4614.4332263020. The cubic root of 21292994 is about 277.1695886184.

The spelling of 21292994 in words is "twenty-one million, two hundred ninety-two thousand, nine hundred ninety-four".