21231203122 has 8 divisors (see below), whose sum is σ = 32524396416. Its totient is φ = 10389737652.

The previous prime is 21231203107. The next prime is 21231203177. The reversal of 21231203122 is 22130213212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21231203122.

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, 112931838 + ... + 112932025.

It is an arithmetic number, because the mean of its divisors is an integer number (4065549552).

Almost surely, 2^21231203122 is an apocalyptic number.

21231203122 is a deficient number, since it is larger than the sum of its proper divisors (11293193294).

21231203122 is a wasteful number, since it uses less digits than its factorization.

21231203122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225863912.

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

Adding to 21231203122 its reverse (22130213212), we get a palindrome (43361416334).

The spelling of 21231203122 in words is "twenty-one billion, two hundred thirty-one million, two hundred three thousand, one hundred twenty-two".