23121203202 has 12 divisors (see below), whose sum is σ = 50095940310. Its totient is φ = 7707067728.

The previous prime is 23121203191. The next prime is 23121203219. The reversal of 23121203202 is 20230212132.

It can be written as a sum of positive squares in only one way, i.e., 22371484041 + 749719161 = 149571^2 + 27381^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1284511289 = 23121203202 / (2 + 3 + 1 + 2 + 1 + 2 + 0 + 3 + 2 + 0 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 642255627 + ... + 642255662.

Almost surely, 2^23121203202 is an apocalyptic number.

23121203202 is an abundant number, since it is smaller than the sum of its proper divisors (26974737108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23121203202 is a wasteful number, since it uses less digits than its factorization.

23121203202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284511297 (or 1284511294 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 23121203202 its reverse (20230212132), we get a palindrome (43351415334).

The spelling of 23121203202 in words is "twenty-three billion, one hundred twenty-one million, two hundred three thousand, two hundred two".