1221000212 has 12 divisors (see below), whose sum is σ = 2140703796. Its totient is φ = 609370560.

The previous prime is 1221000203. The next prime is 1221000227. The reversal of 1221000212 is 2120001221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 396965776 + 824034436 = 19924^2 + 28706^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221000193 and 1221000202.

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, 279953 + ... + 284280.

It is an arithmetic number, because the mean of its divisors is an integer number (178391983).

Almost surely, 2^1221000212 is an apocalyptic number.

It is an amenable number.

1221000212 is a deficient number, since it is larger than the sum of its proper divisors (919703584).

1221000212 is a wasteful number, since it uses less digits than its factorization.

1221000212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564778 (or 564776 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1221000212 is about 34942.8134528403. The cubic root of 1221000212 is about 1068.8216602908.

Adding to 1221000212 its reverse (2120001221), we get a palindrome (3341001433).

The spelling of 1221000212 in words is "one billion, two hundred twenty-one million, two hundred twelve", and thus it is an aban number.