22212215 has 4 divisors (see below), whose sum is σ = 26654664. Its totient is φ = 17769768.

The previous prime is 22212199. The next prime is 22212233. The reversal of 22212215 is 51221222.

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 22212215 - 2⁴ = 22212199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22212193 and 22212202.

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, 2221217 + ... + 2221226.

It is an arithmetic number, because the mean of its divisors is an integer number (6663666).

Almost surely, 2^22212215 is an apocalyptic number.

22212215 is a deficient number, since it is larger than the sum of its proper divisors (4442449).

22212215 is an equidigital number, since it uses as much as digits as its factorization.

22212215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4442448.

The product of its digits is 160, while the sum is 17.

The square root of 22212215 is about 4712.9836621826. The cubic root of 22212215 is about 281.1020133402.

Adding to 22212215 its reverse (51221222), we get a palindrome (73433437).

The spelling of 22212215 in words is "twenty-two million, two hundred twelve thousand, two hundred fifteen".