21393029 has 8 divisors (see below), whose sum is σ = 24481920. Its totient is φ = 18312336.

The previous prime is 21393017. The next prime is 21393041. The reversal of 21393029 is 92039312.

It is an interprime number because it is at equal distance from previous prime (21393017) and next prime (21393041).

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

It is not a de Polignac number, because 21393029 - 2⁸ = 21392773 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21392992 and 21393010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21393049) 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, 5327 + ... + 8435.

It is an arithmetic number, because the mean of its divisors is an integer number (3060240).

Almost surely, 2^21393029 is an apocalyptic number.

It is an amenable number.

21393029 is a deficient number, since it is larger than the sum of its proper divisors (3088891).

21393029 is an equidigital number, since it uses as much as digits as its factorization.

21393029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4099.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 21393029 is about 4625.2598845903. The cubic root of 21393029 is about 277.6029604683.

The spelling of 21393029 in words is "twenty-one million, three hundred ninety-three thousand, twenty-nine".