21422994 has 16 divisors (see below), whose sum is σ = 45101280. Its totient is φ = 6765120.

The previous prime is 21422993. The next prime is 21423007. The reversal of 21422994 is 49922412.

It is not an unprimeable number, because it can be changed into a prime (21422993) 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, 93847 + ... + 94074.

It is an arithmetic number, because the mean of its divisors is an integer number (2818830).

Almost surely, 2^21422994 is an apocalyptic number.

21422994 is an abundant number, since it is smaller than the sum of its proper divisors (23678286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21422994 is a wasteful number, since it uses less digits than its factorization.

21422994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187945.

The product of its digits is 10368, while the sum is 33.

The square root of 21422994 is about 4628.4980285185. The cubic root of 21422994 is about 277.7325118892.

The spelling of 21422994 in words is "twenty-one million, four hundred twenty-two thousand, nine hundred ninety-four".