121521367649 has 4 divisors (see below), whose sum is σ = 132568764720. Its totient is φ = 110473970580.

The previous prime is 121521367633. The next prime is 121521367663. The reversal of 121521367649 is 946763125121.

It is a happy number.

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 not a de Polignac number, because 121521367649 - 2⁴ = 121521367633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121521327649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5523698519 + ... + 5523698540.

It is an arithmetic number, because the mean of its divisors is an integer number (33142191180).

Almost surely, 2^121521367649 is an apocalyptic number.

It is an amenable number.

121521367649 is a deficient number, since it is larger than the sum of its proper divisors (11047397071).

121521367649 is a wasteful number, since it uses less digits than its factorization.

121521367649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11047397070.

The product of its digits is 544320, while the sum is 47.

The spelling of 121521367649 in words is "one hundred twenty-one billion, five hundred twenty-one million, three hundred sixty-seven thousand, six hundred forty-nine".