1221021212002 has 8 divisors (see below), whose sum is σ = 1833406469676. Its totient is φ = 609885722112.

The previous prime is 1221021211999. The next prime is 1221021212017. The reversal of 1221021212002 is 2002121201221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1039153933321 + 181867278681 = 1019389^2 + 426459^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312439503 + ... + 312443410.

Almost surely, 2^{1221021212002} is an apocalyptic number.

1221021212002 is a deficient number, since it is larger than the sum of its proper divisors (612385257674).

1221021212002 is an equidigital number, since it uses as much as digits as its factorization.

1221021212002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624883892.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221021212002 its reverse (2002121201221), we get a palindrome (3223142413223).

The spelling of 1221021212002 in words is "one trillion, two hundred twenty-one billion, twenty-one million, two hundred twelve thousand, two".