1221000111002 has 32 divisors (see below), whose sum is σ = 2167786229760. Its totient is φ = 504938594160.

The previous prime is 1221000110983. The next prime is 1221000111007. The reversal of 1221000111002 is 2001110001221.

It is not an unprimeable number, because it can be changed into a prime (1221000111007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13021052 + ... + 13114487.

It is an arithmetic number, because the mean of its divisors is an integer number (67743319680).

Almost surely, 2^{1221000111002} is an apocalyptic number.

1221000111002 is a deficient number, since it is larger than the sum of its proper divisors (946786118758).

1221000111002 is a wasteful number, since it uses less digits than its factorization.

1221000111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26135666.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221000111002 its reverse (2001110001221), we get a palindrome (3222110112223).

The spelling of 1221000111002 in words is "one trillion, two hundred twenty-one billion, one hundred eleven thousand, two".