21851341 has 8 divisors (see below), whose sum is σ = 23177664. Its totient is φ = 20529600.

The previous prime is 21851329. The next prime is 21851351. The reversal of 21851341 is 14315812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21851341 is a prime.

It is a super-2 number, since 2×21851341² = 954962206996562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21851351) 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, 17256 + ... + 18478.

It is an arithmetic number, because the mean of its divisors is an integer number (2897208).

Almost surely, 2^21851341 is an apocalyptic number.

It is an amenable number.

21851341 is a deficient number, since it is larger than the sum of its proper divisors (1326323).

21851341 is a wasteful number, since it uses less digits than its factorization.

21851341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291.

The product of its digits is 960, while the sum is 25.

The square root of 21851341 is about 4674.5417957271. The cubic root of 21851341 is about 279.5713722469.

The spelling of 21851341 in words is "twenty-one million, eight hundred fifty-one thousand, three hundred forty-one".