121521203331 has 64 divisors (see below), whose sum is σ = 181776337920. Its totient is φ = 71596800000.

The previous prime is 121521203311. The next prime is 121521203351. The reversal of 121521203331 is 133302125121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121521203311) and next prime (121521203351).

It is not a de Polignac number, because 121521203331 - 2⁹ = 121521202819 is a prime.

It is a super-2 number, since 2×121521203331² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121521203311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 44790831 + ... + 44793543.

It is an arithmetic number, because the mean of its divisors is an integer number (2840255280).

Almost surely, 2^121521203331 is an apocalyptic number.

121521203331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121521203331 is a deficient number, since it is larger than the sum of its proper divisors (60255134589).

121521203331 is a wasteful number, since it uses less digits than its factorization.

121521203331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3068.

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 121521203331 its reverse (133302125121), we get a palindrome (254823328452).

The spelling of 121521203331 in words is "one hundred twenty-one billion, five hundred twenty-one million, two hundred three thousand, three hundred thirty-one".