1211013312320 has 112 divisors (see below), whose sum is σ = 3296090423808. Its totient is φ = 415153643520.

The previous prime is 1211013312293. The next prime is 1211013312359. The reversal of 1211013312320 is 232133101121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

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

It is a junction number, because it is equal to n+sod(n) for n = 1211013312292 and 1211013312301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21298649 + ... + 21355431.

It is an arithmetic number, because the mean of its divisors is an integer number (29429378784).

Almost surely, 2^{1211013312320} is an apocalyptic number.

1211013312320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211013312320 is an abundant number, since it is smaller than the sum of its proper divisors (2085077111488).

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

1211013312320 is an equidigital number, since it uses as much as digits as its factorization.

1211013312320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66328 (or 66318 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1211013312320 its reverse (232133101121), we get a palindrome (1443146413441).

The spelling of 1211013312320 in words is "one trillion, two hundred eleven billion, thirteen million, three hundred twelve thousand, three hundred twenty".