20001212123122 has 4 divisors (see below), whose sum is σ = 30001818184686. Its totient is φ = 10000606061560.

The previous prime is 20001212123111. The next prime is 20001212123141. The reversal of 20001212123122 is 22132121210002.

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., 11861197992081 + 8140014131041 = 3444009^2 + 2853071^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20001212123122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000303030779 + ... + 5000303030782.

Almost surely, 2^{20001212123122} is an apocalyptic number.

20001212123122 is a deficient number, since it is larger than the sum of its proper divisors (10000606061564).

20001212123122 is a wasteful number, since it uses less digits than its factorization.

20001212123122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10000606061563.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20001212123122 its reverse (22132121210002), we get a palindrome (42133333333124).

The spelling of 20001212123122 in words is "twenty trillion, one billion, two hundred twelve million, one hundred twenty-three thousand, one hundred twenty-two".