21449799 has 48 divisors (see below), whose sum is σ = 38231040. Its totient is φ = 11838960.

The previous prime is 21449797. The next prime is 21449807. The reversal of 21449799 is 99794412.

It is a happy number.

It is not a de Polignac number, because 21449799 - 2¹ = 21449797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21449797) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40752 + ... + 41274.

It is an arithmetic number, because the mean of its divisors is an integer number (796480).

Almost surely, 2^21449799 is an apocalyptic number.

21449799 is a deficient number, since it is larger than the sum of its proper divisors (16781241).

21449799 is a wasteful number, since it uses less digits than its factorization.

21449799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 564 counting only the distinct ones).

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

The square root of 21449799 is about 4631.3927710787. The cubic root of 21449799 is about 277.8482989600.

The spelling of 21449799 in words is "twenty-one million, four hundred forty-nine thousand, seven hundred ninety-nine".