1161398421140 has 48 divisors (see below), whose sum is σ = 2450931210000. Its totient is φ = 462277186560.

The previous prime is 1161398421137. The next prime is 1161398421143. The reversal of 1161398421140 is 411248931611.

It is an interprime number because it is at equal distance from previous prime (1161398421137) and next prime (1161398421143).

It can be written as a sum of positive squares in 8 ways, for example, as 46460940304 + 1114937480836 = 215548^2 + 1055906^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161398421143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7476986 + ... + 7630734.

It is an arithmetic number, because the mean of its divisors is an integer number (51061066875).

Almost surely, 2^{1161398421140} is an apocalyptic number.

1161398421140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161398421140 is an abundant number, since it is smaller than the sum of its proper divisors (1289532788860).

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

1161398421140 is a wasteful number, since it uses less digits than its factorization.

1161398421140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155612 (or 155610 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The spelling of 1161398421140 in words is "one trillion, one hundred sixty-one billion, three hundred ninety-eight million, four hundred twenty-one thousand, one hundred forty".