21231210202 has 16 divisors (see below), whose sum is σ = 32168678400. Its totient is φ = 10508360400.

The previous prime is 21231210197. The next prime is 21231210229. The reversal of 21231210202 is 20201213212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1536199 + ... + 1549957.

It is an arithmetic number, because the mean of its divisors is an integer number (2010542400).

Almost surely, 2^21231210202 is an apocalyptic number.

21231210202 is a deficient number, since it is larger than the sum of its proper divisors (10937468198).

21231210202 is a wasteful number, since it uses less digits than its factorization.

21231210202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21501.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21231210202 its reverse (20201213212), we get a palindrome (41432423414).

The spelling of 21231210202 in words is "twenty-one billion, two hundred thirty-one million, two hundred ten thousand, two hundred two".