121542532503 has 24 divisors (see below), whose sum is σ = 190458423792. Its totient is φ = 68736858624.

The previous prime is 121542532499. The next prime is 121542532523. The reversal of 121542532503 is 305235245121.

It is not a de Polignac number, because 121542532503 - 2² = 121542532499 is a prime.

It is a super-2 number, since 2×121542532503² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121542532523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4247700 + ... + 4276217.

It is an arithmetic number, because the mean of its divisors is an integer number (7935767658).

Almost surely, 2^121542532503 is an apocalyptic number.

121542532503 is a deficient number, since it is larger than the sum of its proper divisors (68915891289).

121542532503 is an equidigital number, since it uses as much as digits as its factorization.

121542532503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8524031 (or 8524024 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 121542532503 its reverse (305235245121), we get a palindrome (426777777624).

The spelling of 121542532503 in words is "one hundred twenty-one billion, five hundred forty-two million, five hundred thirty-two thousand, five hundred three".