261021110000121 has 8 divisors (see below), whose sum is σ = 386697940740960. Its totient is φ = 174014073333396.

The previous prime is 261021110000071. The next prime is 261021110000153. The reversal of 261021110000121 is 121000011120162.

261021110000121 is a `hidden beast` number, since 2 + 610 + 21 + 1 + 10 + 0 + 0 + 0 + 1 + 21 = 666.

It is not a de Polignac number, because 261021110000121 - 2²³ = 261021101611513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261021110000094 and 261021110000103.

It is not an unprimeable number, because it can be changed into a prime (261021110000191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4833724259235 + ... + 4833724259288.

It is an arithmetic number, because the mean of its divisors is an integer number (48337242592620).

Almost surely, 2^{261021110000121} is an apocalyptic number.

It is an amenable number.

261021110000121 is a deficient number, since it is larger than the sum of its proper divisors (125676830740839).

261021110000121 is an equidigital number, since it uses as much as digits as its factorization.

261021110000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9667448518532 (or 9667448518526 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 261021110000121 its reverse (121000011120162), we get a palindrome (382021121120283).

The spelling of 261021110000121 in words is "two hundred sixty-one trillion, twenty-one billion, one hundred ten million, one hundred twenty-one", and thus it is an aban number.