261421121154043 has 4 divisors (see below), whose sum is σ = 261422141244120. Its totient is φ = 261420101063968.

The previous prime is 261421121153999. The next prime is 261421121154097. The reversal of 261421121154043 is 340451121124162.

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

It is a cyclic number.

It is not a de Polignac number, because 261421121154043 - 2³³ = 261412531219451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261421121153993 and 261421121154011.

It is not an unprimeable number, because it can be changed into a prime (261421121154943) 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, 509660533 + ... + 510173206.

It is an arithmetic number, because the mean of its divisors is an integer number (65355535311030).

Almost surely, 2^{261421121154043} is an apocalyptic number.

261421121154043 is a deficient number, since it is larger than the sum of its proper divisors (1020090077).

261421121154043 is a wasteful number, since it uses less digits than its factorization.

261421121154043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020090076.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 261421121154043 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, one hundred twenty-one million, one hundred fifty-four thousand, forty-three".