21629343 has 4 divisors (see below), whose sum is σ = 28839128. Its totient is φ = 14419560.

The previous prime is 21629329. The next prime is 21629347. The reversal of 21629343 is 34392612.

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

It is not a de Polignac number, because 21629343 - 2⁴ = 21629327 is a prime.

It is a super-2 number, since 2×21629343² = 935656957223298, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 21629343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21629347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3604888 + ... + 3604893.

It is an arithmetic number, because the mean of its divisors is an integer number (7209782).

Almost surely, 2^21629343 is an apocalyptic number.

21629343 is a deficient number, since it is larger than the sum of its proper divisors (7209785).

21629343 is an equidigital number, since it uses as much as digits as its factorization.

21629343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7209784.

The product of its digits is 7776, while the sum is 30.

The square root of 21629343 is about 4650.7357482446. The cubic root of 21629343 is about 278.6213823444.

The spelling of 21629343 in words is "twenty-one million, six hundred twenty-nine thousand, three hundred forty-three".