20021211022021 has 36 divisors (see below), whose sum is σ = 23399736529120. Its totient is φ = 17114117328000.

The previous prime is 20021211022019. The next prime is 20021211022039. The reversal of 20021211022021 is 12022011212002.

It is a happy number.

It is not a de Polignac number, because 20021211022021 - 2¹ = 20021211022019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021211021986 and 20021211022004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021211025021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 36480040 + ... + 37024798.

Almost surely, 2^{20021211022021} is an apocalyptic number.

It is an amenable number.

20021211022021 is a deficient number, since it is larger than the sum of its proper divisors (3378525507099).

20021211022021 is a wasteful number, since it uses less digits than its factorization.

20021211022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545866 (or 545838 counting only the distinct ones).

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

Adding to 20021211022021 its reverse (12022011212002), we get a palindrome (32043222234023).

The spelling of 20021211022021 in words is "twenty trillion, twenty-one billion, two hundred eleven million, twenty-two thousand, twenty-one".