21341429 has 4 divisors (see below), whose sum is σ = 21350784. Its totient is φ = 21332076.

The previous prime is 21341407. The next prime is 21341479. The reversal of 21341429 is 92414312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21341429 - 2¹⁶ = 21275893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21341398 and 21341407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21341479) 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, 1244 + ... + 6650.

It is an arithmetic number, because the mean of its divisors is an integer number (5337696).

Almost surely, 2^21341429 is an apocalyptic number.

It is an amenable number.

21341429 is a deficient number, since it is larger than the sum of its proper divisors (9355).

21341429 is an equidigital number, since it uses as much as digits as its factorization.

21341429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9354.

The product of its digits is 1728, while the sum is 26.

The square root of 21341429 is about 4619.6784520137. The cubic root of 21341429 is about 277.3795879394.

It can be divided in two parts, 2 and 1341429, that added together give a palindrome (1341431).

The spelling of 21341429 in words is "twenty-one million, three hundred forty-one thousand, four hundred twenty-nine".