21434315 has 24 divisors (see below), whose sum is σ = 30287520. Its totient is φ = 14517888.

The previous prime is 21434293. The next prime is 21434323. The reversal of 21434315 is 51343412.

It is not a de Polignac number, because 21434315 - 2⁶ = 21434251 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21314 + ... + 22296.

It is an arithmetic number, because the mean of its divisors is an integer number (1261980).

Almost surely, 2^21434315 is an apocalyptic number.

21434315 is a deficient number, since it is larger than the sum of its proper divisors (8853205).

21434315 is an equidigital number, since it uses as much as digits as its factorization.

21434315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091 (or 1084 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 21434315 is about 4629.7208339164. The cubic root of 21434315 is about 277.7814259373.

Adding to 21434315 its reverse (51343412), we get a palindrome (72777727).

The spelling of 21434315 in words is "twenty-one million, four hundred thirty-four thousand, three hundred fifteen".