21402933 has 4 divisors (see below), whose sum is σ = 28537248. Its totient is φ = 14268620.

The previous prime is 21402919. The next prime is 21402947. The reversal of 21402933 is 33920412.

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.

It is an interprime number because it is at equal distance from previous prime (21402919) and next prime (21402947).

It is a cyclic number.

It is not a de Polignac number, because 21402933 - 2¹² = 21398837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402233) 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, 3567153 + ... + 3567158.

It is an arithmetic number, because the mean of its divisors is an integer number (7134312).

Almost surely, 2^21402933 is an apocalyptic number.

It is an amenable number.

21402933 is a deficient number, since it is larger than the sum of its proper divisors (7134315).

21402933 is an equidigital number, since it uses as much as digits as its factorization.

21402933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7134314.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 21402933 is about 4626.3304032462. The cubic root of 21402933 is about 277.6457930432.

The spelling of 21402933 in words is "twenty-one million, four hundred two thousand, nine hundred thirty-three".