1211211021002 has 4 divisors (see below), whose sum is σ = 1816816531506. Its totient is φ = 605605510500.

The previous prime is 1211211021001. The next prime is 1211211021047. The reversal of 1211211021002 is 2001201121121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 795558747481 + 415652273521 = 891941^2 + 644711^2 .

It is not an unprimeable number, because it can be changed into a prime (1211211021001) 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 as a sum of consecutive naturals, namely, 302802755249 + ... + 302802755252.

Almost surely, 2^{1211211021002} is an apocalyptic number.

1211211021002 is a deficient number, since it is larger than the sum of its proper divisors (605605510504).

1211211021002 is an equidigital number, since it uses as much as digits as its factorization.

1211211021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605605510503.

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

Adding to 1211211021002 its reverse (2001201121121), we get a palindrome (3212412142123).

The spelling of 1211211021002 in words is "one trillion, two hundred eleven billion, two hundred eleven million, twenty-one thousand, two".