1020121110202 has 4 divisors (see below), whose sum is σ = 1530181665306. Its totient is φ = 510060555100.

The previous prime is 1020121110163. The next prime is 1020121110209. The reversal of 1020121110202 is 2020111210201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1014776184321 + 5344925881 = 1007361^2 + 73109^2 .

It is a super-2 number, since 2×1020121110202² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1020121110209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255030277549 + ... + 255030277552.

Almost surely, 2^{1020121110202} is an apocalyptic number.

1020121110202 is a deficient number, since it is larger than the sum of its proper divisors (510060555104).

1020121110202 is an equidigital number, since it uses as much as digits as its factorization.

1020121110202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510060555103.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1020121110202 its reverse (2020111210201), we get a palindrome (3040232320403).

Subtracting 1020121110202 from its reverse (2020111210201), we obtain a palindrome (999990099999).

The spelling of 1020121110202 in words is "one trillion, twenty billion, one hundred twenty-one million, one hundred ten thousand, two hundred two".