1020123123202 has 4 divisors (see below), whose sum is σ = 1530184684806. Its totient is φ = 510061561600.

The previous prime is 1020123123191. The next prime is 1020123123203. The reversal of 1020123123202 is 2023213210201.

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., 825643005201 + 194480118001 = 908649^2 + 440999^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1020123123202.

It is not an unprimeable number, because it can be changed into a prime (1020123123203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255030780799 + ... + 255030780802.

Almost surely, 2^{1020123123202} is an apocalyptic number.

1020123123202 is a deficient number, since it is larger than the sum of its proper divisors (510061561604).

1020123123202 is an equidigital number, since it uses as much as digits as its factorization.

1020123123202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510061561603.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 1020123123202 its reverse (2023213210201), we get a palindrome (3043336333403).

The spelling of 1020123123202 in words is "one trillion, twenty billion, one hundred twenty-three million, one hundred twenty-three thousand, two hundred two".