1211031022100 has 72 divisors (see below), whose sum is σ = 2743004019840. Its totient is φ = 463214378880.

The previous prime is 1211031022079. The next prime is 1211031022109. The reversal of 1211031022100 is 12201301121.

It is a super-2 number, since 2×1211031022100² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211031022109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7902809 + ... + 8054591.

Almost surely, 2^{1211031022100} is an apocalyptic number.

1211031022100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211031022100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1371502009920).

1211031022100 is an abundant number, since it is smaller than the sum of its proper divisors (1531972997740).

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

1211031022100 is a wasteful number, since it uses less digits than its factorization.

1211031022100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155289 (or 155282 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1211031022100 its reverse (12201301121), we get a palindrome (1223232323221).

The spelling of 1211031022100 in words is "one trillion, two hundred eleven billion, thirty-one million, twenty-two thousand, one hundred".