20010221020021 has 4 divisors (see below), whose sum is σ = 20105056190944. Its totient is φ = 19915385849100.

The previous prime is 20010221020007. The next prime is 20010221020081. The reversal of 20010221020021 is 12002012201002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20010221020021 - 2¹¹ = 20010221017973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010221019983 and 20010221020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010221020081) 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, 47417585145 + ... + 47417585566.

It is an arithmetic number, because the mean of its divisors is an integer number (5026264047736).

Almost surely, 2^{20010221020021} is an apocalyptic number.

It is an amenable number.

20010221020021 is a deficient number, since it is larger than the sum of its proper divisors (94835170923).

20010221020021 is an equidigital number, since it uses as much as digits as its factorization.

20010221020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94835170922.

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

Adding to 20010221020021 its reverse (12002012201002), we get a palindrome (32012233221023).

The spelling of 20010221020021 in words is "twenty trillion, ten billion, two hundred twenty-one million, twenty thousand, twenty-one".