21914757 has 12 divisors (see below), whose sum is σ = 31749900. Its totient is φ = 14565888.

The previous prime is 21914743. The next prime is 21914759. The reversal of 21914757 is 75741912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10074276 + 11840481 = 3174^2 + 3441^2 .

It is not a de Polignac number, because 21914757 - 2⁴ = 21914741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21914759) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 348 + ... + 6629.

It is an arithmetic number, because the mean of its divisors is an integer number (2645825).

Almost surely, 2^21914757 is an apocalyptic number.

It is an amenable number.

21914757 is a deficient number, since it is larger than the sum of its proper divisors (9835143).

21914757 is a wasteful number, since it uses less digits than its factorization.

21914757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7332 (or 7329 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 21914757 is about 4681.3200061521. The cubic root of 21914757 is about 279.8415642789.

The spelling of 21914757 in words is "twenty-one million, nine hundred fourteen thousand, seven hundred fifty-seven".