1213011275850 has 672 divisors, whose sum is σ = 3836184468480. Its totient is φ = 282669264000.

The previous prime is 1213011275831. The next prime is 1213011275857. The reversal of 1213011275850 is 585721103121.

1213011275850 is a `hidden beast` number, since 1 + 2 + 1 + 301 + 1 + 275 + 85 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (1213011275857) by changing a digit.

It is a polite number, since it can be written in 335 ways as a sum of consecutive naturals, for example, 1111833805 + ... + 1111834895.

It is an arithmetic number, because the mean of its divisors is an integer number (5708607840).

Almost surely, 2^{1213011275850} is an apocalyptic number.

1213011275850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213011275850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1918092234240).

1213011275850 is an abundant number, since it is smaller than the sum of its proper divisors (2623173192630).

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

1213011275850 is a wasteful number, since it uses less digits than its factorization.

1213011275850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238 (or 1218 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

Adding to 1213011275850 its reverse (585721103121), we get a palindrome (1798732378971).

The spelling of 1213011275850 in words is "one trillion, two hundred thirteen billion, eleven million, two hundred seventy-five thousand, eight hundred fifty".