40281121321081 has 15 divisors (see below), whose sum is σ = 42521362820223. Its totient is φ = 38158891718760.

The previous prime is 40281121321079. The next prime is 40281121321117. The reversal of 40281121321081 is 18012312118204.

The square root of 40281121321081 is 6346741.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10250940520681 + 30030180800400 = 3201709^2 + 5479980^2 .

It is not a de Polignac number, because 40281121321081 - 2¹ = 40281121321079 is a prime.

It is a super-2 number, since 2×40281121321081² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40281121321981) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2291164711 + ... + 2291182291.

Almost surely, 2^{40281121321081} is an apocalyptic number.

40281121321081 is the 6346741-st square number.

40281121321081 is the 3173371-st centered octagonal number.

It is an amenable number.

40281121321081 is a deficient number, since it is larger than the sum of its proper divisors (2240241499142).

40281121321081 is an frugal number, since it uses more digits than its factorization.

40281121321081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35238 (or 17600 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

Adding to 40281121321081 its reverse (18012312118204), we get a palindrome (58293433439285).

The spelling of 40281121321081 in words is "forty trillion, two hundred eighty-one billion, one hundred twenty-one million, three hundred twenty-one thousand, eighty-one".