1221140042343 has 48 divisors (see below), whose sum is σ = 1906594120704. Its totient is φ = 748686991680.

The previous prime is 1221140042341. The next prime is 1221140042399. The reversal of 1221140042343 is 3432400411221.

1221140042343 is a `hidden beast` number, since 1 + 2 + 21 + 1 + 400 + 4 + 234 + 3 = 666.

It is not a de Polignac number, because 1221140042343 - 2¹ = 1221140042341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221140042341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86703180 + ... + 86717262.

It is an arithmetic number, because the mean of its divisors is an integer number (39720710848).

Almost surely, 2^{1221140042343} is an apocalyptic number.

1221140042343 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221140042343 is a deficient number, since it is larger than the sum of its proper divisors (685454078361).

1221140042343 is a wasteful number, since it uses less digits than its factorization.

1221140042343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16796 (or 16793 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 1221140042343 its reverse (3432400411221), we get a palindrome (4653540453564).

The spelling of 1221140042343 in words is "one trillion, two hundred twenty-one billion, one hundred forty million, forty-two thousand, three hundred forty-three".