1221011000002 has 16 divisors (see below), whose sum is σ = 1844074108800. Its totient is φ = 606320810928.

The previous prime is 1221010999981. The next prime is 1221011000039. The reversal of 1221011000002 is 2000001101221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1802503 + ... + 2385589.

It is an arithmetic number, because the mean of its divisors is an integer number (115254631800).

Almost surely, 2^{1221011000002} is an apocalyptic number.

1221011000002 is a deficient number, since it is larger than the sum of its proper divisors (623063108798).

1221011000002 is a wasteful number, since it uses less digits than its factorization.

1221011000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590265.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1221011000002 its reverse (2000001101221), we get a palindrome (3221012101223).

The spelling of 1221011000002 in words is "one trillion, two hundred twenty-one billion, eleven million, two", and thus it is an aban number.