1221002000012 has 6 divisors (see below), whose sum is σ = 2136753500028. Its totient is φ = 610501000004.

The previous prime is 1221001999993. The next prime is 1221002000033. The reversal of 1221002000012 is 2100002001221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221001999957 and 1221002000002.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152625249998 + ... + 152625250005.

It is an arithmetic number, because the mean of its divisors is an integer number (356125583338).

Almost surely, 2^{1221002000012} is an apocalyptic number.

It is an amenable number.

1221002000012 is a deficient number, since it is larger than the sum of its proper divisors (915751500016).

1221002000012 is a wasteful number, since it uses less digits than its factorization.

1221002000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305250500007 (or 305250500005 counting only the distinct ones).

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

Adding to 1221002000012 its reverse (2100002001221), we get a palindrome (3321004001233).

The spelling of 1221002000012 in words is "one trillion, two hundred twenty-one billion, two million, twelve", and thus it is an aban number.