1221100010002 has 8 divisors (see below), whose sum is σ = 1831655090700. Its totient is φ = 610548313104.

The previous prime is 1221100009999. The next prime is 1221100010003. The reversal of 1221100010002 is 2000100011221.

It can be written as a sum of positive squares in 2 ways, for example, as 1220912292601 + 187717401 = 1104949^2 + 13701^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1221100010003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458524 + ... + 1628632.

Almost surely, 2^{1221100010002} is an apocalyptic number.

1221100010002 is a deficient number, since it is larger than the sum of its proper divisors (610555080698).

1221100010002 is a wasteful number, since it uses less digits than its factorization.

1221100010002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1691900.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1221100010002 its reverse (2000100011221), we get a palindrome (3221200021223).

The spelling of 1221100010002 in words is "one trillion, two hundred twenty-one billion, one hundred million, ten thousand, two".