21850349 has 4 divisors (see below), whose sum is σ = 21862236. Its totient is φ = 21838464.

The previous prime is 21850343. The next prime is 21850357. The reversal of 21850349 is 94305812.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 20994724 + 855625 = 4582^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 21850349 - 2⁴ = 21850333 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21850343) 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, 2534 + ... + 7079.

It is an arithmetic number, because the mean of its divisors is an integer number (5465559).

Almost surely, 2^21850349 is an apocalyptic number.

It is an amenable number.

21850349 is a deficient number, since it is larger than the sum of its proper divisors (11887).

21850349 is an equidigital number, since it uses as much as digits as its factorization.

21850349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11886.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 21850349 is about 4674.4356878665. The cubic root of 21850349 is about 279.5671415531.

The spelling of 21850349 in words is "twenty-one million, eight hundred fifty thousand, three hundred forty-nine".