1020121111502 has 16 divisors (see below), whose sum is σ = 1628587143072. Its totient is φ = 477569648640.

The previous prime is 1020121111403. The next prime is 1020121111507. The reversal of 1020121111502 is 2051111210201.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 7 ways as a sum of consecutive naturals, for example, 77722874 + ... + 77735997.

It is an arithmetic number, because the mean of its divisors is an integer number (101786696442).

Almost surely, 2^{1020121111502} is an apocalyptic number.

1020121111502 is a deficient number, since it is larger than the sum of its proper divisors (608466031570).

1020121111502 is a wasteful number, since it uses less digits than its factorization.

1020121111502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155459083.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 1020121111502 its reverse (2051111210201), we get a palindrome (3071232321703).

The spelling of 1020121111502 in words is "one trillion, twenty billion, one hundred twenty-one million, one hundred eleven thousand, five hundred two".