21854611 has 2 divisors, whose sum is σ = 21854612. Its totient is φ = 21854610.

The previous prime is 21854593. The next prime is 21854629. The reversal of 21854611 is 11645812.

It is a balanced prime because it is at equal distance from previous prime (21854593) and next prime (21854629).

It is a cyclic number.

It is not a de Polignac number, because 21854611 - 2¹⁵ = 21821843 is a prime.

It is a super-2 number, since 2×21854611² = 955248043922642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21854611.

It is not a weakly prime, because it can be changed into another prime (21854641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10927305 + 10927306.

It is an arithmetic number, because the mean of its divisors is an integer number (10927306).

Almost surely, 2^21854611 is an apocalyptic number.

21854611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21854611 is an equidigital number, since it uses as much as digits as its factorization.

21854611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 28.

The square root of 21854611 is about 4674.8915495442. The cubic root of 21854611 is about 279.5853172765.

The spelling of 21854611 in words is "twenty-one million, eight hundred fifty-four thousand, six hundred eleven".