20002121012 has 6 divisors (see below), whose sum is σ = 35003711778. Its totient is φ = 10001060504.

The previous prime is 20002121011. The next prime is 20002121033. The reversal of 20002121012 is 21012120002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12697683856 + 7304437156 = 112684^2 + 85466^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20002120984 and 20002121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002121011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500265123 + ... + 2500265130.

It is an arithmetic number, because the mean of its divisors is an integer number (5833951963).

Almost surely, 2^20002121012 is an apocalyptic number.

It is an amenable number.

20002121012 is a deficient number, since it is larger than the sum of its proper divisors (15001590766).

20002121012 is a wasteful number, since it uses less digits than its factorization.

20002121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000530257 (or 5000530255 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20002121012 its reverse (21012120002), we get a palindrome (41014241014).

The spelling of 20002121012 in words is "twenty billion, two million, one hundred twenty-one thousand, twelve".