21494319 has 32 divisors (see below), whose sum is σ = 36072960. Its totient is φ = 11151360.

The previous prime is 21494311. The next prime is 21494329. The reversal of 21494319 is 91349412.

It is not a de Polignac number, because 21494319 - 2³ = 21494311 is a prime.

It is a super-2 number, since 2×21494319² = 924011498547522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 21494319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27567 + ... + 28335.

It is an arithmetic number, because the mean of its divisors is an integer number (1127280).

Almost surely, 2^21494319 is an apocalyptic number.

21494319 is a deficient number, since it is larger than the sum of its proper divisors (14578641).

21494319 is an equidigital number, since it uses as much as digits as its factorization.

21494319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812 (or 790 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 21494319 is about 4636.1966092909. The cubic root of 21494319 is about 278.0403949030.

It can be divided in two parts, 21494 and 319, that multiplied together give a palindrome (6856586).

The spelling of 21494319 in words is "twenty-one million, four hundred ninety-four thousand, three hundred nineteen".