261421131207073 has 4 divisors (see below), whose sum is σ = 262272665836720. Its totient is φ = 260569596577428.

The previous prime is 261421131207059. The next prime is 261421131207077. The reversal of 261421131207073 is 370702131124162.

261421131207073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261421131207073 - 2¹³ = 261421131198881 is a prime.

It is a super-3 number, since 3×261421131207073³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261421131207077) 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, 425767314363 + ... + 425767314976.

It is an arithmetic number, because the mean of its divisors is an integer number (65568166459180).

Almost surely, 2^{261421131207073} is an apocalyptic number.

It is an amenable number.

261421131207073 is a deficient number, since it is larger than the sum of its proper divisors (851534629647).

261421131207073 is an equidigital number, since it uses as much as digits as its factorization.

261421131207073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851534629646.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 261421131207073 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, one hundred thirty-one million, two hundred seven thousand, seventy-three".