20021020120221 has 8 divisors (see below), whose sum is σ = 26699200472160. Its totient is φ = 13345093257552.

The previous prime is 20021020120219. The next prime is 20021020120223. The reversal of 20021020120221 is 12202102012002.

It is an interprime number because it is at equal distance from previous prime (20021020120219) and next prime (20021020120223).

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

It is not a de Polignac number, because 20021020120221 - 2¹ = 20021020120219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20021020120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021020120223) 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, 563351586 + ... + 563387123.

It is an arithmetic number, because the mean of its divisors is an integer number (3337400059020).

Almost surely, 2^{20021020120221} is an apocalyptic number.

It is an amenable number.

20021020120221 is a deficient number, since it is larger than the sum of its proper divisors (6678180351939).

20021020120221 is a wasteful number, since it uses less digits than its factorization.

20021020120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126744635.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20021020120221 its reverse (12202102012002), we get a palindrome (32223122132223).

The spelling of 20021020120221 in words is "twenty trillion, twenty-one billion, twenty million, one hundred twenty thousand, two hundred twenty-one".