20021100010221 has 32 divisors (see below), whose sum is σ = 27301891737600. Its totient is φ = 13047726706560.

The previous prime is 20021100010211. The next prime is 20021100010229. The reversal of 20021100010221 is 12201000112002.

It is not a de Polignac number, because 20021100010221 - 2¹⁵ = 20021099977453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021100010197 and 20021100010206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021100010229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11492266 + ... + 13119236.

It is an arithmetic number, because the mean of its divisors is an integer number (853184116800).

Almost surely, 2^{20021100010221} is an apocalyptic number.

It is an amenable number.

20021100010221 is a deficient number, since it is larger than the sum of its proper divisors (7280791727379).

20021100010221 is a wasteful number, since it uses less digits than its factorization.

20021100010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627569.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20021100010221 its reverse (12201000112002), we get a palindrome (32222100122223).

The spelling of 20021100010221 in words is "twenty trillion, twenty-one billion, one hundred million, ten thousand, two hundred twenty-one".