21035090 has 16 divisors (see below), whose sum is σ = 39856320. Its totient is φ = 7971120.

The previous prime is 21035059. The next prime is 21035111. The reversal of 21035090 is 9053012.

It is a super-2 number, since 2×21035090² = 884950022616200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55166 + ... + 55545.

It is an arithmetic number, because the mean of its divisors is an integer number (2491020).

Almost surely, 2^21035090 is an apocalyptic number.

21035090 is a deficient number, since it is larger than the sum of its proper divisors (18821230).

21035090 is a wasteful number, since it uses less digits than its factorization.

21035090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110737.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 21035090 is about 4586.4027298091. The cubic root of 21035090 is about 276.0459998244.

The spelling of 21035090 in words is "twenty-one million, thirty-five thousand, ninety".