21900271 has 2 divisors, whose sum is σ = 21900272. Its totient is φ = 21900270.

The previous prime is 21900259. The next prime is 21900283. The reversal of 21900271 is 17200912.

It is a balanced prime because it is at equal distance from previous prime (21900259) and next prime (21900283).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21900271 is a prime.

21900271 is a modest number, since divided by 271 gives 219 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21900371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10950135 + 10950136.

It is an arithmetic number, because the mean of its divisors is an integer number (10950136).

Almost surely, 2^21900271 is an apocalyptic number.

21900271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21900271 is an equidigital number, since it uses as much as digits as its factorization.

21900271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 21900271 is about 4679.7725372073. The cubic root of 21900271 is about 279.7798907921.

The spelling of 21900271 in words is "twenty-one million, nine hundred thousand, two hundred seventy-one".