1221001120002 has 32 divisors (see below), whose sum is σ = 2502104855040. Its totient is φ = 396987569280.

The previous prime is 1221001119967. The next prime is 1221001120007. The reversal of 1221001120002 is 2000211001221.

It is a super-2 number, since 2×1221001120002² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221001120002.

It is not an unprimeable number, because it can be changed into a prime (1221001120007) 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, 606228 + ... + 1676160.

It is an arithmetic number, because the mean of its divisors is an integer number (78190776720).

Almost surely, 2^{1221001120002} is an apocalyptic number.

1221001120002 is an abundant number, since it is smaller than the sum of its proper divisors (1281103735038).

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

1221001120002 is a wasteful number, since it uses less digits than its factorization.

1221001120002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074618.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1221001120002 its reverse (2000211001221), we get a palindrome (3221212121223).

The spelling of 1221001120002 in words is "one trillion, two hundred twenty-one billion, one million, one hundred twenty thousand, two".