20001212021011 has 16 divisors (see below), whose sum is σ = 22900359134016. Its totient is φ = 17326726724736.

The previous prime is 20001212020997. The next prime is 20001212021023. The reversal of 20001212021011 is 11012021210002.

It is not a de Polignac number, because 20001212021011 - 2¹⁹ = 20001211496723 is a prime.

It is a super-2 number, since 2×20001212021011² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 20001212020982 and 20001212021000.

It is not an unprimeable number, because it can be changed into a prime (20001212021311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 631056660 + ... + 631088353.

It is an arithmetic number, because the mean of its divisors is an integer number (1431272445876).

Almost surely, 2^{20001212021011} is an apocalyptic number.

20001212021011 is a deficient number, since it is larger than the sum of its proper divisors (2899147113005).

20001212021011 is a wasteful number, since it uses less digits than its factorization.

20001212021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262145102.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20001212021011 its reverse (11012021210002), we get a palindrome (31013233231013).

The spelling of 20001212021011 in words is "twenty trillion, one billion, two hundred twelve million, twenty-one thousand, eleven".