20231221034 has 4 divisors (see below), whose sum is σ = 30346831554. Its totient is φ = 10115610516.

The previous prime is 20231221027. The next prime is 20231221037. The reversal of 20231221034 is 43012213202.

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., 17293039009 + 2938182025 = 131503^2 + 54205^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20231220997 and 20231221015.

It is not an unprimeable number, because it can be changed into a prime (20231221037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5057805257 + ... + 5057805260.

Almost surely, 2^20231221034 is an apocalyptic number.

20231221034 is a deficient number, since it is larger than the sum of its proper divisors (10115610520).

20231221034 is a wasteful number, since it uses less digits than its factorization.

20231221034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10115610519.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20231221034 its reverse (43012213202), we get a palindrome (63243434236).

The spelling of 20231221034 in words is "twenty billion, two hundred thirty-one million, two hundred twenty-one thousand, thirty-four".