21222835 has 4 divisors (see below), whose sum is σ = 25467408. Its totient is φ = 16978264.

The previous prime is 21222787. The next prime is 21222847. The reversal of 21222835 is 53822212.

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

It is a cyclic number.

It is not a de Polignac number, because 21222835 - 2¹³ = 21214643 is a prime.

It is a Duffinian 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, 2122279 + ... + 2122288.

It is an arithmetic number, because the mean of its divisors is an integer number (6366852).

Almost surely, 2^21222835 is an apocalyptic number.

21222835 is a deficient number, since it is larger than the sum of its proper divisors (4244573).

21222835 is an equidigital number, since it uses as much as digits as its factorization.

21222835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4244572.

The product of its digits is 1920, while the sum is 25.

The square root of 21222835 is about 4606.8248284475. The cubic root of 21222835 is about 276.8648352014.

The spelling of 21222835 in words is "twenty-one million, two hundred twenty-two thousand, eight hundred thirty-five".