21886253 has 2 divisors, whose sum is σ = 21886254. Its totient is φ = 21886252.

The previous prime is 21886243. The next prime is 21886283. The reversal of 21886253 is 35268812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15342889 + 6543364 = 3917^2 + 2558^2 .

It is a cyclic number.

It is not a de Polignac number, because 21886253 - 2⁴ = 21886237 is a prime.

It is equal to p_1382489 and since 21886253 and 1382489 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21886223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10943126 + 10943127.

It is an arithmetic number, because the mean of its divisors is an integer number (10943127).

Almost surely, 2^21886253 is an apocalyptic number.

It is an amenable number.

21886253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21886253 is an equidigital number, since it uses as much as digits as its factorization.

21886253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 35.

The square root of 21886253 is about 4678.2745750971. The cubic root of 21886253 is about 279.7201838962.

The spelling of 21886253 in words is "twenty-one million, eight hundred eighty-six thousand, two hundred fifty-three".