2540306236621 has 4 divisors (see below), whose sum is σ = 2540309482044. Its totient is φ = 2540302991200.

The previous prime is 2540306236607. The next prime is 2540306236651. The reversal of 2540306236621 is 1266326030452.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 842835999721 + 1697470236900 = 918061^2 + 1302870^2 .

It is a cyclic number.

It is not a de Polignac number, because 2540306236621 - 2⁹ = 2540306236109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540306236651) 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, 354201 + ... + 2281681.

It is an arithmetic number, because the mean of its divisors is an integer number (635077370511).

Almost surely, 2^{2540306236621} is an apocalyptic number.

It is an amenable number.

2540306236621 is a deficient number, since it is larger than the sum of its proper divisors (3245423).

2540306236621 is a wasteful number, since it uses less digits than its factorization.

2540306236621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245422.

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 2540306236621 in words is "two trillion, five hundred forty billion, three hundred six million, two hundred thirty-six thousand, six hundred twenty-one".