1221131021002 has 4 divisors (see below), whose sum is σ = 1831696531506. Its totient is φ = 610565510500.

The previous prime is 1221131020973. The next prime is 1221131021017. The reversal of 1221131021002 is 2001201311221.

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., 1094971795281 + 126159225721 = 1046409^2 + 355189^2 .

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 as a sum of consecutive naturals, namely, 305282755249 + ... + 305282755252.

Almost surely, 2^{1221131021002} is an apocalyptic number.

1221131021002 is a deficient number, since it is larger than the sum of its proper divisors (610565510504).

1221131021002 is an equidigital number, since it uses as much as digits as its factorization.

1221131021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610565510503.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1221131021002 its reverse (2001201311221), we get a palindrome (3222332332223).

The spelling of 1221131021002 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-one million, twenty-one thousand, two".