21677090 has 16 divisors (see below), whose sum is σ = 39137472. Its totient is φ = 8644464.

The previous prime is 21677077. The next prime is 21677093. The reversal of 21677090 is 9077612.

It is not an unprimeable number, because it can be changed into a prime (21677093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347 + ... + 6593.

It is an arithmetic number, because the mean of its divisors is an integer number (2446092).

Almost surely, 2^21677090 is an apocalyptic number.

21677090 is a deficient number, since it is larger than the sum of its proper divisors (17460382).

21677090 is a wasteful number, since it uses less digits than its factorization.

21677090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6601.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 21677090 is about 4655.8661922353. The cubic root of 21677090 is about 278.8262515360.

The spelling of 21677090 in words is "twenty-one million, six hundred seventy-seven thousand, ninety".