21464291 has 2 divisors, whose sum is σ = 21464292. Its totient is φ = 21464290.

The previous prime is 21464269. The next prime is 21464293. The reversal of 21464291 is 19246412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21464291 - 2⁶ = 21464227 is a prime.

Together with 21464293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21464293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732145 + 10732146.

It is an arithmetic number, because the mean of its divisors is an integer number (10732146).

Almost surely, 2^21464291 is an apocalyptic number.

21464291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21464291 is an equidigital number, since it uses as much as digits as its factorization.

21464291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 21464291 is about 4632.9570470705. The cubic root of 21464291 is about 277.9108585372.

It can be divided in two parts, 2146 and 4291, that multiplied together give a triangular number (9208486 = T₄₂₉₁).

The spelling of 21464291 in words is "twenty-one million, four hundred sixty-four thousand, two hundred ninety-one".