1020121111503 has 32 divisors (see below), whose sum is σ = 1627926937280. Its totient is φ = 627619000320.

The previous prime is 1020121111403. The next prime is 1020121111507. The reversal of 1020121111503 is 3051111210201.

1020121111503 is a `hidden beast` number, since 10 + 20 + 1 + 21 + 111 + 503 = 666.

It is not a de Polignac number, because 1020121111503 - 2¹⁰ = 1020121110479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020121111507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1159743 + ... + 1839903.

It is an arithmetic number, because the mean of its divisors is an integer number (50872716790).

Almost surely, 2^{1020121111503} is an apocalyptic number.

1020121111503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1020121111503 is a deficient number, since it is larger than the sum of its proper divisors (607805825777).

1020121111503 is a wasteful number, since it uses less digits than its factorization.

1020121111503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684456 (or 684450 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

Adding to 1020121111503 its reverse (3051111210201), we get a palindrome (4071232321704).

The spelling of 1020121111503 in words is "one trillion, twenty billion, one hundred twenty-one million, one hundred eleven thousand, five hundred three".