21916292 has 6 divisors (see below), whose sum is σ = 38353518. Its totient is φ = 10958144.

The previous prime is 21916267. The next prime is 21916313. The reversal of 21916292 is 29261912.

It can be written as a sum of positive squares in only one way, i.e., 13424896 + 8491396 = 3664^2 + 2914^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2739533 + ... + 2739540.

It is an arithmetic number, because the mean of its divisors is an integer number (6392253).

Almost surely, 2^21916292 is an apocalyptic number.

It is an amenable number.

21916292 is a deficient number, since it is larger than the sum of its proper divisors (16437226).

21916292 is a wasteful number, since it uses less digits than its factorization.

21916292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5479077 (or 5479075 counting only the distinct ones).

The product of its digits is 3888, while the sum is 32.

The square root of 21916292 is about 4681.4839527654. The cubic root of 21916292 is about 279.8480978790.

The spelling of 21916292 in words is "twenty-one million, nine hundred sixteen thousand, two hundred ninety-two".