121403521531 has 8 divisors (see below), whose sum is σ = 121946950944. Its totient is φ = 120861073920.

The previous prime is 121403521529. The next prime is 121403521549. The reversal of 121403521531 is 135125304121.

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 121403521531 - 2¹ = 121403521529 is a prime.

It is a super-2 number, since 2×121403521531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121403521531.

It is not an unprimeable number, because it can be changed into a prime (121403521501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2971 + ... + 492763.

It is an arithmetic number, because the mean of its divisors is an integer number (15243368868).

Almost surely, 2^121403521531 is an apocalyptic number.

121403521531 is a deficient number, since it is larger than the sum of its proper divisors (543429413).

121403521531 is an equidigital number, since it uses as much as digits as its factorization.

121403521531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490901.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 121403521531 its reverse (135125304121), we get a palindrome (256528825652).

The spelling of 121403521531 in words is "one hundred twenty-one billion, four hundred three million, five hundred twenty-one thousand, five hundred thirty-one".