20121231422 has 16 divisors (see below), whose sum is σ = 31054221072. Its totient is φ = 9771986880.

The previous prime is 20121231409. The next prime is 20121231437. The reversal of 20121231422 is 22413212102.

It is a junction number, because it is equal to n+sod(n) for n = 20121231394 and 20121231403.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 521873 + ... + 559100.

It is an arithmetic number, because the mean of its divisors is an integer number (1940888817).

Almost surely, 2^20121231422 is an apocalyptic number.

20121231422 is a deficient number, since it is larger than the sum of its proper divisors (10932989650).

20121231422 is a wasteful number, since it uses less digits than its factorization.

20121231422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081243.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20121231422 its reverse (22413212102), we get a palindrome (42534443524).

The spelling of 20121231422 in words is "twenty billion, one hundred twenty-one million, two hundred thirty-one thousand, four hundred twenty-two".