21994310 has 32 divisors (see below), whose sum is σ = 42844032. Its totient is φ = 8081280.

The previous prime is 21994237. The next prime is 21994319. The reversal of 21994310 is 1349912.

It is a happy number.

It is a super-2 number, since 2×21994310² = 967499344752200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21994319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47480 + ... + 47940.

It is an arithmetic number, because the mean of its divisors is an integer number (1338876).

Almost surely, 2^21994310 is an apocalyptic number.

21994310 is a deficient number, since it is larger than the sum of its proper divisors (20849722).

21994310 is a wasteful number, since it uses less digits than its factorization.

21994310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 21994310 is about 4689.8091645610. The cubic root of 21994310 is about 280.1797740072.

The spelling of 21994310 in words is "twenty-one million, nine hundred ninety-four thousand, three hundred ten".