1211378125320 has 384 divisors, whose sum is σ = 4460703436800. Its totient is φ = 282446092800.

The previous prime is 1211378125291. The next prime is 1211378125333. The reversal of 1211378125320 is 235218731121.

1211378125320 is a `hidden beast` number, since 1 + 2 + 11 + 37 + 81 + 2 + 532 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19979611 + ... + 20040149.

It is an arithmetic number, because the mean of its divisors is an integer number (11616415200).

Almost surely, 2^{1211378125320} is an apocalyptic number.

1211378125320 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 1211378125320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2230351718400).

1211378125320 is an abundant number, since it is smaller than the sum of its proper divisors (3249325311480).

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

1211378125320 is a wasteful number, since it uses less digits than its factorization.

1211378125320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60761 (or 60754 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 1211378125320 in words is "one trillion, two hundred eleven billion, three hundred seventy-eight million, one hundred twenty-five thousand, three hundred twenty".