1211342421320 has 256 divisors, whose sum is σ = 3026535840000. Its totient is φ = 434651443200.

The previous prime is 1211342421319. The next prime is 1211342421337. The reversal of 1211342421320 is 231242431121.

It is a happy number.

It is a super-3 number, since 3×1211342421320³ (a number of 37 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211342421320.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 167563466 + ... + 167570694.

It is an arithmetic number, because the mean of its divisors is an integer number (11822405625).

Almost surely, 2^{1211342421320} is an apocalyptic number.

1211342421320 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 1211342421320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1513267920000).

1211342421320 is an abundant number, since it is smaller than the sum of its proper divisors (1815193418680).

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

1211342421320 is a wasteful number, since it uses less digits than its factorization.

1211342421320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7456 (or 7452 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 1211342421320 its reverse (231242431121), we get a palindrome (1442584852441).

The spelling of 1211342421320 in words is "one trillion, two hundred eleven billion, three hundred forty-two million, four hundred twenty-one thousand, three hundred twenty".