20121231434 has 4 divisors (see below), whose sum is σ = 30181847154. Its totient is φ = 10060615716.

The previous prime is 20121231409. The next prime is 20121231437. The reversal of 20121231434 is 43413212102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20108090809 + 13140625 = 141803^2 + 3625^2 .

It is a super-3 number, since 3×20121231434³ (a number of 32 digits) contains 333 as substring.

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 as a sum of consecutive naturals, namely, 5030307857 + ... + 5030307860.

Almost surely, 2^20121231434 is an apocalyptic number.

20121231434 is a deficient number, since it is larger than the sum of its proper divisors (10060615720).

20121231434 is a wasteful number, since it uses less digits than its factorization.

20121231434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10060615719.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20121231434 its reverse (43413212102), we get a palindrome (63534443536).

The spelling of 20121231434 in words is "twenty billion, one hundred twenty-one million, two hundred thirty-one thousand, four hundred thirty-four".