212121238 has 16 divisors (see below), whose sum is σ = 363860640. Its totient is φ = 90853056.

The previous prime is 212121209. The next prime is 212121289. The reversal of 212121238 is 832121212.

212121238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×212121238² = 89990839221305288, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25620 + ... + 32872.

It is an arithmetic number, because the mean of its divisors is an integer number (22741290).

Almost surely, 2^212121238 is an apocalyptic number.

212121238 is a deficient number, since it is larger than the sum of its proper divisors (151739402).

212121238 is a wasteful number, since it uses less digits than its factorization.

212121238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9351.

The product of its digits is 384, while the sum is 22.

The square root of 212121238 is about 14564.3825135156. The cubic root of 212121238 is about 596.3868391605.

The spelling of 212121238 in words is "two hundred twelve million, one hundred twenty-one thousand, two hundred thirty-eight".