21494799 has 12 divisors (see below), whose sum is σ = 31091112. Its totient is φ = 14310000.

The previous prime is 21494791. The next prime is 21494807. The reversal of 21494799 is 99749412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21494791) and next prime (21494807).

It is not a de Polignac number, because 21494799 - 2³ = 21494791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8424 + ... + 10674.

It is an arithmetic number, because the mean of its divisors is an integer number (2590926).

Almost surely, 2^21494799 is an apocalyptic number.

21494799 is a deficient number, since it is larger than the sum of its proper divisors (9596313).

21494799 is a wasteful number, since it uses less digits than its factorization.

21494799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3318 (or 3315 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 21494799 is about 4636.2483755726. The cubic root of 21494799 is about 278.0424645723.

The spelling of 21494799 in words is "twenty-one million, four hundred ninety-four thousand, seven hundred ninety-nine".