1211342442440 has 96 divisors (see below), whose sum is σ = 2952456998400. Its totient is φ = 447090059520.

The previous prime is 1211342442439. The next prime is 1211342442493. The reversal of 1211342442440 is 442442431121.

It is a junction number, because it is equal to n+sod(n) for n = 1211342442397 and 1211342442406.

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, 17941145 + ... + 18008535.

It is an arithmetic number, because the mean of its divisors is an integer number (30754760400).

Almost surely, 2^{1211342442440} is an apocalyptic number.

1211342442440 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 1211342442440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1476228499200).

1211342442440 is an abundant number, since it is smaller than the sum of its proper divisors (1741114555960).

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

1211342442440 is a wasteful number, since it uses less digits than its factorization.

1211342442440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70087 (or 70070 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 32.

Adding to 1211342442440 its reverse (442442431121), we get a palindrome (1653784873561).

The spelling of 1211342442440 in words is "one trillion, two hundred eleven billion, three hundred forty-two million, four hundred forty-two thousand, four hundred forty".