1221011211002 has 8 divisors (see below), whose sum is σ = 1998018345312. Its totient is φ = 555005095900.

The previous prime is 1221011211001. The next prime is 1221011211023. The reversal of 1221011211002 is 2001121101221.

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

It is not an unprimeable number, because it can be changed into a prime (1221011211001) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 27750254774 + ... + 27750254817.

It is an arithmetic number, because the mean of its divisors is an integer number (249752293164).

Almost surely, 2^{1221011211002} is an apocalyptic number.

1221011211002 is a deficient number, since it is larger than the sum of its proper divisors (777007134310).

1221011211002 is a wasteful number, since it uses less digits than its factorization.

1221011211002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55500509604.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221011211002 its reverse (2001121101221), we get a palindrome (3222132312223).

The spelling of 1221011211002 in words is "one trillion, two hundred twenty-one billion, eleven million, two hundred eleven thousand, two".