21794949 has 12 divisors (see below), whose sum is σ = 34343712. Its totient is φ = 13209000.

The previous prime is 21794947. The next prime is 21794977. The reversal of 21794949 is 94949712.

It is a happy number.

It is not a de Polignac number, because 21794949 - 2¹ = 21794947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21794947) 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, 109977 + ... + 110174.

It is an arithmetic number, because the mean of its divisors is an integer number (2861976).

Almost surely, 2^21794949 is an apocalyptic number.

It is an amenable number.

21794949 is a deficient number, since it is larger than the sum of its proper divisors (12548763).

21794949 is a wasteful number, since it uses less digits than its factorization.

21794949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220168 (or 220165 counting only the distinct ones).

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

The square root of 21794949 is about 4668.5060779654. The cubic root of 21794949 is about 279.3306674096.

The spelling of 21794949 in words is "twenty-one million, seven hundred ninety-four thousand, nine hundred forty-nine".