1211027398380 has 144 divisors (see below), whose sum is σ = 3753025436160. Its totient is φ = 316019810304.

The previous prime is 1211027398363. The next prime is 1211027398393. The reversal of 1211027398380 is 838937201121.

1211027398380 is a `hidden beast` number, since 1 + 2 + 110 + 2 + 73 + 98 + 380 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1164277 + ... + 1943603.

It is an arithmetic number, because the mean of its divisors is an integer number (26062676640).

Almost surely, 2^{1211027398380} is an apocalyptic number.

1211027398380 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 1211027398380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1876512718080).

1211027398380 is an abundant number, since it is smaller than the sum of its proper divisors (2541998037780).

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

1211027398380 is a wasteful number, since it uses less digits than its factorization.

1211027398380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779528 (or 779523 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 1211027398380 in words is "one trillion, two hundred eleven billion, twenty-seven million, three hundred ninety-eight thousand, three hundred eighty".