121549072699 has 4 divisors (see below), whose sum is σ = 125470010560. Its totient is φ = 117628134840.

The previous prime is 121549072681. The next prime is 121549072787. The reversal of 121549072699 is 996270945121.

It is a happy number.

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 121549072699 - 2¹¹ = 121549070651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121549072639) 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, 1960468884 + ... + 1960468945.

It is an arithmetic number, because the mean of its divisors is an integer number (31367502640).

Almost surely, 2^121549072699 is an apocalyptic number.

121549072699 is a deficient number, since it is larger than the sum of its proper divisors (3920937861).

121549072699 is an equidigital number, since it uses as much as digits as its factorization.

121549072699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920937860.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 121549072699 in words is "one hundred twenty-one billion, five hundred forty-nine million, seventy-two thousand, six hundred ninety-nine".