1211021212 has 24 divisors (see below), whose sum is σ = 2173248000. Its totient is φ = 590154096.

The previous prime is 1211021173. The next prime is 1211021213. The reversal of 1211021212 is 2121201121.

It is a junction number, because it is equal to n+sod(n) for n = 1211021192 and 1211021201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211021213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75039 + ... + 89737.

It is an arithmetic number, because the mean of its divisors is an integer number (90552000).

Almost surely, 2^1211021212 is an apocalyptic number.

It is an amenable number.

1211021212 is a deficient number, since it is larger than the sum of its proper divisors (962226788).

1211021212 is a wasteful number, since it uses less digits than its factorization.

1211021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15225 (or 15223 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1211021212 is about 34799.7300564243. The cubic root of 1211021212 is about 1065.9019336798.

Adding to 1211021212 its reverse (2121201121), we get a palindrome (3332222333).

The spelling of 1211021212 in words is "one billion, two hundred eleven million, twenty-one thousand, two hundred twelve".