21757052 has 24 divisors (see below), whose sum is σ = 40938240. Its totient is φ = 10085040.

The previous prime is 21757051. The next prime is 21757079. The reversal of 21757052 is 25075712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21757051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 527 + ... + 6617.

It is an arithmetic number, because the mean of its divisors is an integer number (1705760).

Almost surely, 2^21757052 is an apocalyptic number.

It is an amenable number.

21757052 is a deficient number, since it is larger than the sum of its proper divisors (19181188).

21757052 is a wasteful number, since it uses less digits than its factorization.

21757052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6161 (or 6159 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 21757052 is about 4664.4455190301. The cubic root of 21757052 is about 279.1686736719.

The spelling of 21757052 in words is "twenty-one million, seven hundred fifty-seven thousand, fifty-two".