21431210122 has 32 divisors (see below), whose sum is σ = 37931765760. Its totient is φ = 8890197120.

The previous prime is 21431210117. The next prime is 21431210131. The reversal of 21431210122 is 22101213412.

It is a self number, because there is not a number n which added to its sum of digits gives 21431210122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74097 + ... + 219892.

It is an arithmetic number, because the mean of its divisors is an integer number (1185367680).

Almost surely, 2^21431210122 is an apocalyptic number.

21431210122 is a deficient number, since it is larger than the sum of its proper divisors (16500555638).

21431210122 is a wasteful number, since it uses less digits than its factorization.

21431210122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294166.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21431210122 its reverse (22101213412), we get a palindrome (43532423534).

The spelling of 21431210122 in words is "twenty-one billion, four hundred thirty-one million, two hundred ten thousand, one hundred twenty-two".