1221221111002 has 8 divisors (see below), whose sum is σ = 1831836355200. Its totient is φ = 610608992604.

The previous prime is 1221221110937. The next prime is 1221221111053. The reversal of 1221221111002 is 2001111221221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1154149 + ... + 1942807.

It is an arithmetic number, because the mean of its divisors is an integer number (228979544400).

Almost surely, 2^{1221221111002} is an apocalyptic number.

1221221111002 is a deficient number, since it is larger than the sum of its proper divisors (610615244198).

1221221111002 is an equidigital number, since it uses as much as digits as its factorization.

1221221111002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562900.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221221111002 its reverse (2001111221221), we get a palindrome (3222332332223).

The spelling of 1221221111002 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, two".