1211122021100 has 36 divisors (see below), whose sum is σ = 2639712521544. Its totient is φ = 482314663680.

The previous prime is 1211122021099. The next prime is 1211122021103. The reversal of 1211122021100 is 11202211121.

It is not an unprimeable number, because it can be changed into a prime (1211122021103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26653997 + ... + 26699396.

Almost surely, 2^{1211122021100} is an apocalyptic number.

1211122021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211122021100 is an abundant number, since it is smaller than the sum of its proper divisors (1428590500444).

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

1211122021100 is a wasteful number, since it uses less digits than its factorization.

1211122021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53353634 (or 53353627 counting only the distinct ones).

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

Adding to 1211122021100 its reverse (11202211121), we get a palindrome (1222324232221).

The spelling of 1211122021100 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, twenty-one thousand, one hundred".