20121231430 has 8 divisors (see below), whose sum is σ = 36218216592. Its totient is φ = 8048492568.

The previous prime is 20121231409. The next prime is 20121231437. The reversal of 20121231430 is 3413212102.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 20121231398 and 20121231407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121231437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1006061562 + ... + 1006061581.

It is an arithmetic number, because the mean of its divisors is an integer number (4527277074).

Almost surely, 2^20121231430 is an apocalyptic number.

20121231430 is a deficient number, since it is larger than the sum of its proper divisors (16096985162).

20121231430 is a wasteful number, since it uses less digits than its factorization.

20121231430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012123150.

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

Adding to 20121231430 its reverse (3413212102), we get a palindrome (23534443532).

The spelling of 20121231430 in words is "twenty billion, one hundred twenty-one million, two hundred thirty-one thousand, four hundred thirty".