21348429 has 8 divisors (see below), whose sum is σ = 29382912. Its totient is φ = 13773120.

The previous prime is 21348421. The next prime is 21348433. The reversal of 21348429 is 92484312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21348429 - 2³ = 21348421 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21348429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114684 + ... + 114869.

It is an arithmetic number, because the mean of its divisors is an integer number (3672864).

Almost surely, 2^21348429 is an apocalyptic number.

It is an amenable number.

21348429 is a deficient number, since it is larger than the sum of its proper divisors (8034483).

21348429 is a wasteful number, since it uses less digits than its factorization.

21348429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229587.

The product of its digits is 13824, while the sum is 33.

The square root of 21348429 is about 4620.4360183861. The cubic root of 21348429 is about 277.4099115081.

It can be divided in two parts, 2 and 1348429, that added together give a palindrome (1348431).

The spelling of 21348429 in words is "twenty-one million, three hundred forty-eight thousand, four hundred twenty-nine".