202021002123 has 4 divisors (see below), whose sum is σ = 269361336168. Its totient is φ = 134680668080.

The previous prime is 202021002119. The next prime is 202021002173. The reversal of 202021002123 is 321200120202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 202021002123 - 2² = 202021002119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (202021002173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33670167018 + ... + 33670167023.

It is an arithmetic number, because the mean of its divisors is an integer number (67340334042).

Almost surely, 2^202021002123 is an apocalyptic number.

202021002123 is a deficient number, since it is larger than the sum of its proper divisors (67340334045).

202021002123 is an equidigital number, since it uses as much as digits as its factorization.

202021002123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67340334044.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 202021002123 its reverse (321200120202), we get a palindrome (523221122325).

The spelling of 202021002123 in words is "two hundred two billion, twenty-one million, two thousand, one hundred twenty-three".