121503511025 has 12 divisors (see below), whose sum is σ = 162253919772. Its totient is φ = 89725669440.

The previous prime is 121503510923. The next prime is 121503511091. The reversal of 121503511025 is 520115305121.

It can be written as a sum of positive squares in 6 ways, for example, as 31047184 + 121472463841 = 5572^2 + 348529^2 .

It is a de Polignac number, because none of the positive numbers 2^k-121503511025 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121503510985 and 121503511003.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186928154 + ... + 186928803.

It is an arithmetic number, because the mean of its divisors is an integer number (13521159981).

Almost surely, 2^121503511025 is an apocalyptic number.

It is an amenable number.

121503511025 is a deficient number, since it is larger than the sum of its proper divisors (40750408747).

121503511025 is a wasteful number, since it uses less digits than its factorization.

121503511025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373856980 (or 373856975 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 26.

Adding to 121503511025 its reverse (520115305121), we get a palindrome (641618816146).

The spelling of 121503511025 in words is "one hundred twenty-one billion, five hundred three million, five hundred eleven thousand, twenty-five".