21231120202 has 8 divisors (see below), whose sum is σ = 32295225312. Its totient is φ = 10466045100.

The previous prime is 21231120187. The next prime is 21231120223. The reversal of 21231120202 is 20202113212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74757324 + ... + 74757607.

It is an arithmetic number, because the mean of its divisors is an integer number (4036903164).

Almost surely, 2^21231120202 is an apocalyptic number.

21231120202 is a deficient number, since it is larger than the sum of its proper divisors (11064105110).

21231120202 is a wasteful number, since it uses less digits than its factorization.

21231120202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149515004.

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

Adding to 21231120202 its reverse (20202113212), we get a palindrome (41433233414).

The spelling of 21231120202 in words is "twenty-one billion, two hundred thirty-one million, one hundred twenty thousand, two hundred two".