21752053 has 2 divisors, whose sum is σ = 21752054. Its totient is φ = 21752052.

The previous prime is 21752039. The next prime is 21752113. The reversal of 21752053 is 35025712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 3833764 = 4233^2 + 1958^2 .

It is a cyclic number.

It is not a de Polignac number, because 21752053 - 2⁵ = 21752021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21758053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876026 + 10876027.

It is an arithmetic number, because the mean of its divisors is an integer number (10876027).

Almost surely, 2^21752053 is an apocalyptic number.

It is an amenable number.

21752053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21752053 is an equidigital number, since it uses as much as digits as its factorization.

21752053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 21752053 is about 4663.9096260541. The cubic root of 21752053 is about 279.1472910094.

Adding to 21752053 its reverse (35025712), we get a palindrome (56777765).

The spelling of 21752053 in words is "twenty-one million, seven hundred fifty-two thousand, fifty-three".