21146903 has 2 divisors, whose sum is σ = 21146904. Its totient is φ = 21146902.

The previous prime is 21146891. The next prime is 21146911. The reversal of 21146903 is 30964112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21146903 - 2²⁰ = 20098327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21146953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10573451 + 10573452.

It is an arithmetic number, because the mean of its divisors is an integer number (10573452).

Almost surely, 2^21146903 is an apocalyptic number.

21146903 is a deficient number, since it is larger than the sum of its proper divisors (1).

21146903 is an equidigital number, since it uses as much as digits as its factorization.

21146903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21146903 is about 4598.5761926927. The cubic root of 21146903 is about 276.5342475294.

The spelling of 21146903 in words is "twenty-one million, one hundred forty-six thousand, nine hundred three".