1221001111002 has 8 divisors (see below), whose sum is σ = 2442002222016. Its totient is φ = 407000370332.

The previous prime is 1221001110991. The next prime is 1221001111013. The reversal of 1221001111002 is 2001111001221.

It is an interprime number because it is at equal distance from previous prime (1221001110991) and next prime (1221001111013).

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

1221001111002 is an admirable number.

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, 101750092578 + ... + 101750092589.

It is an arithmetic number, because the mean of its divisors is an integer number (305250277752).

Almost surely, 2^{1221001111002} is an apocalyptic number.

1221001111002 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221001111002 is a wasteful number, since it uses less digits than its factorization.

1221001111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203500185172.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1221001111002 its reverse (2001111001221), we get a palindrome (3222112112223).

The spelling of 1221001111002 in words is "one trillion, two hundred twenty-one billion, one million, one hundred eleven thousand, two".