21210794 has 16 divisors (see below), whose sum is σ = 34780320. Its totient is φ = 9621360.

The previous prime is 21210773. The next prime is 21210799. The reversal of 21210794 is 49701212.

It is a super-2 number, since 2×21210794² = 899795564220872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21210799) 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, 17657 + ... + 18819.

It is an arithmetic number, because the mean of its divisors is an integer number (2173770).

Almost surely, 2^21210794 is an apocalyptic number.

21210794 is a deficient number, since it is larger than the sum of its proper divisors (13569526).

21210794 is a wasteful number, since it uses less digits than its factorization.

21210794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 21210794 is about 4605.5177776228. The cubic root of 21210794 is about 276.8124645645.

The spelling of 21210794 in words is "twenty-one million, two hundred ten thousand, seven hundred ninety-four".