212121244 has 12 divisors (see below), whose sum is σ = 390749800. Its totient is φ = 100478448.

The previous prime is 212121209. The next prime is 212121289. The reversal of 212121244 is 442121212.

212121244 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 2×212121244² = 89990844312215072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a nude number because it is divisible by every one of its digits.

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, 1395459 + ... + 1395610.

Almost surely, 2^212121244 is an apocalyptic number.

It is an amenable number.

212121244 is a deficient number, since it is larger than the sum of its proper divisors (178628556).

212121244 is a wasteful number, since it uses less digits than its factorization.

212121244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2791092 (or 2791090 counting only the distinct ones).

The product of its digits is 256, while the sum is 19.

The square root of 212121244 is about 14564.3827194976. The cubic root of 212121244 is about 596.3868447835.

Adding to 212121244 its reverse (442121212), we get a palindrome (654242456).

The spelling of 212121244 in words is "two hundred twelve million, one hundred twenty-one thousand, two hundred forty-four".