20002021222021 has 4 divisors (see below), whose sum is σ = 20006136022444. Its totient is φ = 19997906421600.

The previous prime is 20002021222003. The next prime is 20002021222037. The reversal of 20002021222021 is 12022212020002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15149913659521 + 4852107562500 = 3892289^2 + 2202750^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002021222021 - 2⁵ = 20002021221989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002021221986 and 20002021222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002021222061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2057392920 + ... + 2057402641.

It is an arithmetic number, because the mean of its divisors is an integer number (5001534005611).

Almost surely, 2^{20002021222021} is an apocalyptic number.

It is an amenable number.

20002021222021 is a deficient number, since it is larger than the sum of its proper divisors (4114800423).

20002021222021 is an equidigital number, since it uses as much as digits as its factorization.

20002021222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4114800422.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20002021222021 its reverse (12022212020002), we get a palindrome (32024233242023).

It can be divided in two parts, 2000202 and 1222021, that added together give a palindrome (3222223).

The spelling of 20002021222021 in words is "twenty trillion, two billion, twenty-one million, two hundred twenty-two thousand, twenty-one".