20121234442 has 16 divisors (see below), whose sum is σ = 32036970312. Its totient is φ = 9445196800.

The previous prime is 20121234431. The next prime is 20121234457. The reversal of 20121234442 is 24443212102.

It can be written as a sum of positive squares in 4 ways, for example, as 19695596281 + 425638161 = 140341^2 + 20631^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724273 + ... + 751540.

Almost surely, 2^20121234442 is an apocalyptic number.

20121234442 is a deficient number, since it is larger than the sum of its proper divisors (11915735870).

20121234442 is a wasteful number, since it uses less digits than its factorization.

20121234442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476233.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 20121234442 its reverse (24443212102), we get a palindrome (44564446544).

The spelling of 20121234442 in words is "twenty billion, one hundred twenty-one million, two hundred thirty-four thousand, four hundred forty-two".