21292413 has 4 divisors (see below), whose sum is σ = 28389888. Its totient is φ = 14194940.

The previous prime is 21292393. The next prime is 21292417. The reversal of 21292413 is 31429212.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21292413 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21292417) 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, 3548733 + ... + 3548738.

It is an arithmetic number, because the mean of its divisors is an integer number (7097472).

Almost surely, 2^21292413 is an apocalyptic number.

It is an amenable number.

21292413 is a deficient number, since it is larger than the sum of its proper divisors (7097475).

21292413 is an equidigital number, since it uses as much as digits as its factorization.

21292413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7097474.

The product of its digits is 864, while the sum is 24.

The square root of 21292413 is about 4614.3702712288. The cubic root of 21292413 is about 277.1670676485.

The spelling of 21292413 in words is "twenty-one million, two hundred ninety-two thousand, four hundred thirteen".