21107090 has 8 divisors (see below), whose sum is σ = 37992780. Its totient is φ = 8442832.

The previous prime is 21107083. The next prime is 21107101. The reversal of 21107090 is 9070112.

It can be written as a sum of positive squares in 2 ways, for example, as 19989841 + 1117249 = 4471^2 + 1057^2 .

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

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, 1055345 + ... + 1055364.

Almost surely, 2^21107090 is an apocalyptic number.

21107090 is a deficient number, since it is larger than the sum of its proper divisors (16885690).

21107090 is a wasteful number, since it uses less digits than its factorization.

21107090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110716.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 21107090 is about 4594.2453134329. The cubic root of 21107090 is about 276.3605960263.

The spelling of 21107090 in words is "twenty-one million, one hundred seven thousand, ninety".