121215402523 has 2 divisors, whose sum is σ = 121215402524. Its totient is φ = 121215402522.

The previous prime is 121215402521. The next prime is 121215402527. The reversal of 121215402523 is 325204512121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121215402523 - 2¹ = 121215402521 is a prime.

Together with 121215402521, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 121215402491 and 121215402500.

It is not a weakly prime, because it can be changed into another prime (121215402521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60607701261 + 60607701262.

It is an arithmetic number, because the mean of its divisors is an integer number (60607701262).

Almost surely, 2^121215402523 is an apocalyptic number.

121215402523 is a deficient number, since it is larger than the sum of its proper divisors (1).

121215402523 is an equidigital number, since it uses as much as digits as its factorization.

121215402523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 121215402523 its reverse (325204512121), we get a palindrome (446419914644).

The spelling of 121215402523 in words is "one hundred twenty-one billion, two hundred fifteen million, four hundred two thousand, five hundred twenty-three".