121521497999 has 8 divisors (see below), whose sum is σ = 132593381760. Its totient is φ = 110453693400.

The previous prime is 121521497983. The next prime is 121521498001. The reversal of 121521497999 is 999794125121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121521497999 - 2⁴ = 121521497983 is a prime.

It is a super-2 number, since 2×121521497999² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121521497299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 957329 + ... + 1076810.

It is an arithmetic number, because the mean of its divisors is an integer number (16574172720).

Almost surely, 2^121521497999 is an apocalyptic number.

121521497999 is a deficient number, since it is larger than the sum of its proper divisors (11071883761).

121521497999 is a wasteful number, since it uses less digits than its factorization.

121521497999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039581.

The product of its digits is 3674160, while the sum is 59.

It can be divided in two parts, 12152 and 1497999, that added together give a palindrome (1510151).

The spelling of 121521497999 in words is "one hundred twenty-one billion, five hundred twenty-one million, four hundred ninety-seven thousand, nine hundred ninety-nine".