261421121132671 has 8 divisors (see below), whose sum is σ = 262807223148288. Its totient is φ = 260035200420000.

The previous prime is 261421121132629. The next prime is 261421121132681. The reversal of 261421121132671 is 176231121124162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261421121132671 - 2²³ = 261421112744063 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 (261421121132621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42433800 + ... + 48202381.

It is an arithmetic number, because the mean of its divisors is an integer number (32850902893536).

Almost surely, 2^{261421121132671} is an apocalyptic number.

261421121132671 is a deficient number, since it is larger than the sum of its proper divisors (1386102015617).

261421121132671 is a wasteful number, since it uses less digits than its factorization.

261421121132671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90651473.

The product of its digits is 48384, while the sum is 40.

The spelling of 261421121132671 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, one hundred twenty-one million, one hundred thirty-two thousand, six hundred seventy-one".