20010021022021 has 16 divisors (see below), whose sum is σ = 21086427047040. Its totient is φ = 18935948171520.

The previous prime is 20010021021997. The next prime is 20010021022037. The reversal of 20010021022021 is 12022012001002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20010021022021 - 2⁹ = 20010021021509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010021021992 and 20010021022010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010021022421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86767456 + ... + 86997766.

It is an arithmetic number, because the mean of its divisors is an integer number (1317901690440).

Almost surely, 2^{20010021022021} is an apocalyptic number.

It is an amenable number.

20010021022021 is a deficient number, since it is larger than the sum of its proper divisors (1076406025019).

20010021022021 is a wasteful number, since it uses less digits than its factorization.

20010021022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235356.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20010021022021 its reverse (12022012001002), we get a palindrome (32032033023023).

The spelling of 20010021022021 in words is "twenty trillion, ten billion, twenty-one million, twenty-two thousand, twenty-one".