21464269 has 2 divisors, whose sum is σ = 21464270. Its totient is φ = 21464268.

The previous prime is 21464249. The next prime is 21464291. The reversal of 21464269 is 96246412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14730244 + 6734025 = 3838^2 + 2595^2 .

It is a cyclic number.

It is not a de Polignac number, because 21464269 - 2¹³ = 21456077 is a prime.

It is a super-2 number, since 2×21464269² = 921429687408722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21464239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732134 + 10732135.

It is an arithmetic number, because the mean of its divisors is an integer number (10732135).

Almost surely, 2^21464269 is an apocalyptic number.

It is an amenable number.

21464269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21464269 is an equidigital number, since it uses as much as digits as its factorization.

21464269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 21464269 is about 4632.9546727763. The cubic root of 21464269 is about 277.9107635882.

The spelling of 21464269 in words is "twenty-one million, four hundred sixty-four thousand, two hundred sixty-nine".