20021210221021 has 8 divisors (see below), whose sum is σ = 20360628792000. Its totient is φ = 19681794184320.

The previous prime is 20021210220997. The next prime is 20021210221073. The reversal of 20021210221021 is 12012201212002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20021210221021 - 2¹⁵ = 20021210188253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021210220986 and 20021210221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021210221721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22243080 + ... + 23125678.

It is an arithmetic number, because the mean of its divisors is an integer number (2545078599000).

Almost surely, 2^{20021210221021} is an apocalyptic number.

It is an amenable number.

20021210221021 is a deficient number, since it is larger than the sum of its proper divisors (339418570979).

20021210221021 is an equidigital number, since it uses as much as digits as its factorization.

20021210221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267139.

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

Adding to 20021210221021 its reverse (12012201212002), we get a palindrome (32033411433023).

The spelling of 20021210221021 in words is "twenty trillion, twenty-one billion, two hundred ten million, two hundred twenty-one thousand, twenty-one".