21610053 has 6 divisors (see below), whose sum is σ = 31214534. Its totient is φ = 14406696.

The previous prime is 21610027. The next prime is 21610067. The reversal of 21610053 is 35001612.

21610053 is a `hidden beast` number, since 2 + 1 + 610 + 0 + 53 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21178404 + 431649 = 4602^2 + 657^2 .

It is not a de Polignac number, because 21610053 - 2¹³ = 21601861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21610003) 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 5 ways as a sum of consecutive naturals, for example, 1200550 + ... + 1200567.

Almost surely, 2^21610053 is an apocalyptic number.

It is an amenable number.

21610053 is a deficient number, since it is larger than the sum of its proper divisors (9604481).

21610053 is a wasteful number, since it uses less digits than its factorization.

21610053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401123 (or 2401120 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 21610053 is about 4648.6614202370. The cubic root of 21610053 is about 278.5385287717.

Adding to 21610053 its reverse (35001612), we get a palindrome (56611665).

It can be divided in two parts, 216100 and 53, that added together give a triangular number (216153 = T₆₅₇).

The spelling of 21610053 in words is "twenty-one million, six hundred ten thousand, fifty-three".