1211220001002 has 32 divisors (see below), whose sum is σ = 2757560163840. Its totient is φ = 351078260720.

The previous prime is 1211220000989. The next prime is 1211220001003. The reversal of 1211220001002 is 2001000221121.

It is not an unprimeable number, because it can be changed into a prime (1211220001003) 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, 398951052 + ... + 398954087.

It is an arithmetic number, because the mean of its divisors is an integer number (86173755120).

Almost surely, 2^{1211220001002} is an apocalyptic number.

1211220001002 is an abundant number, since it is smaller than the sum of its proper divisors (1546340162838).

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

1211220001002 is a wasteful number, since it uses less digits than its factorization.

1211220001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797905178.

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

Adding to 1211220001002 its reverse (2001000221121), we get a palindrome (3212220222123).

The spelling of 1211220001002 in words is "one trillion, two hundred eleven billion, two hundred twenty million, one thousand, two".