121635565042151 has 4 divisors (see below), whose sum is σ = 121683471923400. Its totient is φ = 121587658160904.

The previous prime is 121635565042127. The next prime is 121635565042193. The reversal of 121635565042151 is 151240565536121.

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 121635565042151 - 2¹⁸ = 121635564780007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121635565042096 and 121635565042105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121635565042111) 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, 23953436816 + ... + 23953441893.

It is an arithmetic number, because the mean of its divisors is an integer number (30420867980850).

Almost surely, 2^{121635565042151} is an apocalyptic number.

121635565042151 is a deficient number, since it is larger than the sum of its proper divisors (47906881249).

121635565042151 is an equidigital number, since it uses as much as digits as its factorization.

121635565042151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47906881248.

The product of its (nonzero) digits is 1080000, while the sum is 47.

The spelling of 121635565042151 in words is "one hundred twenty-one trillion, six hundred thirty-five billion, five hundred sixty-five million, forty-two thousand, one hundred fifty-one".