21757053 has 8 divisors (see below), whose sum is σ = 29485216. Its totient is φ = 14266800.

The previous prime is 21757051. The next prime is 21757079. The reversal of 21757053 is 35075712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21757053 - 2¹ = 21757051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21757053.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59263 + ... + 59628.

It is an arithmetic number, because the mean of its divisors is an integer number (3685652).

Almost surely, 2^21757053 is an apocalyptic number.

It is an amenable number.

21757053 is a deficient number, since it is larger than the sum of its proper divisors (7728163).

21757053 is a wasteful number, since it uses less digits than its factorization.

21757053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118955.

The product of its (nonzero) digits is 7350, while the sum is 30.

The square root of 21757053 is about 4664.4456262240. The cubic root of 21757053 is about 279.1686779489.

The spelling of 21757053 in words is "twenty-one million, seven hundred fifty-seven thousand, fifty-three".