1221110100202 has 16 divisors (see below), whose sum is σ = 1841937493032. Its totient is φ = 607131495360.

The previous prime is 1221110100191. The next prime is 1221110100209. The reversal of 1221110100202 is 2020010111221.

It can be written as a sum of positive squares in 4 ways, for example, as 586221453801 + 634888646401 = 765651^2 + 796799^2 .

It is a super-2 number, since 2×1221110100202² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221110100209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4441128 + ... + 4708060.

Almost surely, 2^{1221110100202} is an apocalyptic number.

1221110100202 is a deficient number, since it is larger than the sum of its proper divisors (620827392830).

1221110100202 is a wasteful number, since it uses less digits than its factorization.

1221110100202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279753.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221110100202 its reverse (2020010111221), we get a palindrome (3241120211423).

The spelling of 1221110100202 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, one hundred thousand, two hundred two".