21402341 has 4 divisors (see below), whose sum is σ = 22528800. Its totient is φ = 20275884.

The previous prime is 21402331. The next prime is 21402373. The reversal of 21402341 is 14320412.

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-21402341 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402331) 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, 563201 + ... + 563238.

It is an arithmetic number, because the mean of its divisors is an integer number (5632200).

Almost surely, 2^21402341 is an apocalyptic number.

It is an amenable number.

21402341 is a deficient number, since it is larger than the sum of its proper divisors (1126459).

21402341 is a wasteful number, since it uses less digits than its factorization.

21402341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126458.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21402341 is about 4626.2664212084. The cubic root of 21402341 is about 277.6432331476.

Adding to 21402341 its reverse (14320412), we get a palindrome (35722753).

The spelling of 21402341 in words is "twenty-one million, four hundred two thousand, three hundred forty-one".