21911485 has 4 divisors (see below), whose sum is σ = 26293788. Its totient is φ = 17529184.

The previous prime is 21911441. The next prime is 21911509. The reversal of 21911485 is 58411912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9821956 + 12089529 = 3134^2 + 3477^2 .

It is a cyclic number.

It is not a de Polignac number, because 21911485 - 2²³ = 13522877 is a prime.

It is a super-2 number, since 2×21911485² = 960226349810450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2191144 + ... + 2191153.

It is an arithmetic number, because the mean of its divisors is an integer number (6573447).

Almost surely, 2^21911485 is an apocalyptic number.

It is an amenable number.

21911485 is a deficient number, since it is larger than the sum of its proper divisors (4382303).

21911485 is an equidigital number, since it uses as much as digits as its factorization.

21911485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4382302.

The product of its digits is 2880, while the sum is 31.

The square root of 21911485 is about 4680.9705190270. The cubic root of 21911485 is about 279.8276362642.

The spelling of 21911485 in words is "twenty-one million, nine hundred eleven thousand, four hundred eighty-five".