1221002012 has 12 divisors (see below), whose sum is σ = 2229656016. Its totient is φ = 583957440.

The previous prime is 1221002011. The next prime is 1221002021. The reversal of 1221002012 is 2102001221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221001984 and 1221002002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221002011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6635789 + ... + 6635972.

It is an arithmetic number, because the mean of its divisors is an integer number (185804668).

Almost surely, 2^1221002012 is an apocalyptic number.

It is an amenable number.

1221002012 is a deficient number, since it is larger than the sum of its proper divisors (1008654004).

1221002012 is a wasteful number, since it uses less digits than its factorization.

1221002012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13271788 (or 13271786 counting only the distinct ones).

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

The square root of 1221002012 is about 34942.8392091999. The cubic root of 1221002012 is about 1068.8221855100.

Adding to 1221002012 its reverse (2102001221), we get a palindrome (3323003233).

The spelling of 1221002012 in words is "one billion, two hundred twenty-one million, two thousand, twelve".