40140821261 has 4 divisors (see below), whose sum is σ = 41119865724. Its totient is φ = 39161776800.

The previous prime is 40140821213. The next prime is 40140821321. The reversal of 40140821261 is 16212804104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21717916900 + 18422904361 = 147370^2 + 135731^2 .

It is a cyclic number.

It is not a de Polignac number, because 40140821261 - 2¹⁴ = 40140804877 is a prime.

It is a super-5 number, since 5×40140821261⁵ (a number of 54 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40140820261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489522170 + ... + 489522251.

It is an arithmetic number, because the mean of its divisors is an integer number (10279966431).

Almost surely, 2^40140821261 is an apocalyptic number.

40140821261 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40140821261 is a deficient number, since it is larger than the sum of its proper divisors (979044463).

40140821261 is an equidigital number, since it uses as much as digits as its factorization.

40140821261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979044462.

The product of its (nonzero) digits is 3072, while the sum is 29.

The spelling of 40140821261 in words is "forty billion, one hundred forty million, eight hundred twenty-one thousand, two hundred sixty-one".