20012012021221 has 12 divisors (see below), whose sum is σ = 22002281997696. Its totient is φ = 18188100314120.

The previous prime is 20012012021171. The next prime is 20012012021233. The reversal of 20012012021221 is 12212021021002.

It is a happy number.

It is not a de Polignac number, because 20012012021221 - 2¹¹ = 20012012019173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012012021195 and 20012012021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012012025221) 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 in 11 ways as a sum of consecutive naturals, for example, 20604661 + ... + 21554026.

It is an arithmetic number, because the mean of its divisors is an integer number (1833523499808).

Almost surely, 2^{20012012021221} is an apocalyptic number.

It is an amenable number.

20012012021221 is a deficient number, since it is larger than the sum of its proper divisors (1990269976475).

20012012021221 is a wasteful number, since it uses less digits than its factorization.

20012012021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42162632 (or 42162621 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20012012021221 its reverse (12212021021002), we get a palindrome (32224033042223).

The spelling of 20012012021221 in words is "twenty trillion, twelve billion, twelve million, twenty-one thousand, two hundred twenty-one".