21082253 has 2 divisors, whose sum is σ = 21082254. Its totient is φ = 21082252.

The previous prime is 21082213. The next prime is 21082277. The reversal of 21082253 is 35228012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 407044 = 4547^2 + 638^2 .

It is a cyclic number.

It is not a de Polignac number, because 21082253 - 2⁶ = 21082189 is a prime.

It is a super-2 number, since 2×21082253² = 888922783112018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21082213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541126 + 10541127.

It is an arithmetic number, because the mean of its divisors is an integer number (10541127).

Almost surely, 2^21082253 is an apocalyptic number.

It is an amenable number.

21082253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21082253 is an equidigital number, since it uses as much as digits as its factorization.

21082253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21082253 is about 4591.5414622978. The cubic root of 21082253 is about 276.2521543890.

The spelling of 21082253 in words is "twenty-one million, eighty-two thousand, two hundred fifty-three".