21464371 has 2 divisors, whose sum is σ = 21464372. Its totient is φ = 21464370.

The previous prime is 21464347. The next prime is 21464393. The reversal of 21464371 is 17346412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21464371 is a prime.

It is not a weakly prime, because it can be changed into another prime (21464671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732185 + 10732186.

It is an arithmetic number, because the mean of its divisors is an integer number (10732186).

Almost surely, 2^21464371 is an apocalyptic number.

21464371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21464371 is an equidigital number, since it uses as much as digits as its factorization.

21464371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 28.

The square root of 21464371 is about 4632.9656808571. The cubic root of 21464371 is about 277.9112038059.

The spelling of 21464371 in words is "twenty-one million, four hundred sixty-four thousand, three hundred seventy-one".