121366151512621 has 4 divisors (see below), whose sum is σ = 121513619498272. Its totient is φ = 121218683526972.

The previous prime is 121366151512609. The next prime is 121366151512667. The reversal of 121366151512621 is 126215151663121.

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 a de Polignac number, because none of the positive numbers 2^k-121366151512621 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 (121366151512691) 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, 73733991591 + ... + 73733993236.

It is an arithmetic number, because the mean of its divisors is an integer number (30378404874568).

Almost surely, 2^{121366151512621} is an apocalyptic number.

It is an amenable number.

121366151512621 is a deficient number, since it is larger than the sum of its proper divisors (147467985651).

121366151512621 is an equidigital number, since it uses as much as digits as its factorization.

121366151512621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147467985650.

The product of its digits is 129600, while the sum is 43.

The spelling of 121366151512621 in words is "one hundred twenty-one trillion, three hundred sixty-six billion, one hundred fifty-one million, five hundred twelve thousand, six hundred twenty-one".