21557014 has 16 divisors (see below), whose sum is σ = 33332688. Its totient is φ = 10448352.

The previous prime is 21556999. The next prime is 21557017. The reversal of 21557014 is 41075512.

It is a self number, because there is not a number n which added to its sum of digits gives 21557014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21557017) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 38424 + ... + 38980.

It is an arithmetic number, because the mean of its divisors is an integer number (2083293).

Almost surely, 2^21557014 is an apocalyptic number.

21557014 is a deficient number, since it is larger than the sum of its proper divisors (11775674).

21557014 is a wasteful number, since it uses less digits than its factorization.

21557014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 21557014 is about 4642.9531550512. The cubic root of 21557014 is about 278.3104634975.

The spelling of 21557014 in words is "twenty-one million, five hundred fifty-seven thousand, fourteen".