21870794 has 16 divisors (see below), whose sum is σ = 36662976. Its totient is φ = 9698400.

The previous prime is 21870791. The next prime is 21870803. The reversal of 21870794 is 49707812.

It is not an unprimeable number, because it can be changed into a prime (21870791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11222 + ... + 13025.

It is an arithmetic number, because the mean of its divisors is an integer number (2291436).

Almost surely, 2^21870794 is an apocalyptic number.

21870794 is a deficient number, since it is larger than the sum of its proper divisors (14792182).

21870794 is a wasteful number, since it uses less digits than its factorization.

21870794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24301.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 21870794 is about 4676.6220715384. The cubic root of 21870794 is about 279.6543097783.

The spelling of 21870794 in words is "twenty-one million, eight hundred seventy thousand, seven hundred ninety-four".