21464351 has 4 divisors (see below), whose sum is σ = 21554400. Its totient is φ = 21374304.

The previous prime is 21464347. The next prime is 21464371. The reversal of 21464351 is 15346412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21464351 - 2² = 21464347 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21464351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21464371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44666 + ... + 45143.

It is an arithmetic number, because the mean of its divisors is an integer number (5388600).

Almost surely, 2^21464351 is an apocalyptic number.

21464351 is a deficient number, since it is larger than the sum of its proper divisors (90049).

21464351 is an equidigital number, since it uses as much as digits as its factorization.

21464351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90048.

The product of its digits is 2880, while the sum is 26.

The square root of 21464351 is about 4632.9635224120. The cubic root of 21464351 is about 277.9111174888.

The spelling of 21464351 in words is "twenty-one million, four hundred sixty-four thousand, three hundred fifty-one".