21757068 has 36 divisors (see below), whose sum is σ = 55291600. Its totient is φ = 7213536.

The previous prime is 21757051. The next prime is 21757079. The reversal of 21757068 is 86075712.

21757068 is a `hidden beast` number, since 21 + 7 + 570 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5646 + ... + 8682.

Almost surely, 2^21757068 is an apocalyptic number.

It is an amenable number.

21757068 is an abundant number, since it is smaller than the sum of its proper divisors (33534532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21757068 is a wasteful number, since it uses less digits than its factorization.

21757068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3246 (or 3241 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 21757068 is about 4664.4472341318. The cubic root of 21757068 is about 279.1687421048.

The spelling of 21757068 in words is "twenty-one million, seven hundred fifty-seven thousand, sixty-eight".