21949316 has 12 divisors (see below), whose sum is σ = 38572380. Its totient is φ = 10928640.

The previous prime is 21949303. The next prime is 21949331. The reversal of 21949316 is 61394912.

It can be written as a sum of positive squares in 2 ways, for example, as 6708100 + 15241216 = 2590^2 + 3904^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10421 + ... + 12348.

It is an arithmetic number, because the mean of its divisors is an integer number (3214365).

Almost surely, 2^21949316 is an apocalyptic number.

It is an amenable number.

21949316 is a deficient number, since it is larger than the sum of its proper divisors (16623064).

21949316 is a wasteful number, since it uses less digits than its factorization.

21949316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23014 (or 23012 counting only the distinct ones).

The product of its digits is 11664, while the sum is 35.

The square root of 21949316 is about 4685.0097118363. The cubic root of 21949316 is about 279.9885879703.

The spelling of 21949316 in words is "twenty-one million, nine hundred forty-nine thousand, three hundred sixteen".