1211340430100 has 72 divisors (see below), whose sum is σ = 2662781529408. Its totient is φ = 478267718400.

The previous prime is 1211340429979. The next prime is 1211340430117. The reversal of 1211340430100 is 10340431121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2970560 + ... + 3353640.

Almost surely, 2^{1211340430100} is an apocalyptic number.

1211340430100 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 1211340430100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1331390764704).

1211340430100 is an abundant number, since it is smaller than the sum of its proper divisors (1451441099308).

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

1211340430100 is a wasteful number, since it uses less digits than its factorization.

1211340430100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383505 (or 383498 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1211340430100 its reverse (10340431121), we get a palindrome (1221680861221).

The spelling of 1211340430100 in words is "one trillion, two hundred eleven billion, three hundred forty million, four hundred thirty thousand, one hundred".