2142342461581 has 16 divisors (see below), whose sum is σ = 2577612648960. Its totient is φ = 1739404482480.

The previous prime is 2142342461579. The next prime is 2142342461599. The reversal of 2142342461581 is 1851642432412.

It is not a de Polignac number, because 2142342461581 - 2¹ = 2142342461579 is a prime.

It is a super-2 number, since 2×2142342461581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142342461081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157831 + ... + 2075956.

It is an arithmetic number, because the mean of its divisors is an integer number (161100790560).

Almost surely, 2^{2142342461581} is an apocalyptic number.

It is an amenable number.

2142342461581 is a deficient number, since it is larger than the sum of its proper divisors (435270187379).

2142342461581 is a wasteful number, since it uses less digits than its factorization.

2142342461581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2241024.

The product of its digits is 368640, while the sum is 43.

Adding to 2142342461581 its reverse (1851642432412), we get a palindrome (3993984893993).

The spelling of 2142342461581 in words is "two trillion, one hundred forty-two billion, three hundred forty-two million, four hundred sixty-one thousand, five hundred eighty-one".