21034297 has 2 divisors, whose sum is σ = 21034298. Its totient is φ = 21034296.

The previous prime is 21034261. The next prime is 21034301. The reversal of 21034297 is 79243012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16088121 + 4946176 = 4011^2 + 2224^2 .

It is a cyclic number.

It is not a de Polignac number, because 21034297 - 2¹⁵ = 21001529 is a prime.

It is not a weakly prime, because it can be changed into another prime (21034997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517148 + 10517149.

It is an arithmetic number, because the mean of its divisors is an integer number (10517149).

Almost surely, 2^21034297 is an apocalyptic number.

It is an amenable number.

21034297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034297 is an equidigital number, since it uses as much as digits as its factorization.

21034297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21034297 is about 4586.3162777986. The cubic root of 21034297 is about 276.0425309029.

It can be divided in two parts, 2103 and 4297, that added together give a square (6400 = 80²).

The spelling of 21034297 in words is "twenty-one million, thirty-four thousand, two hundred ninety-seven".