20211010221 has 4 divisors (see below), whose sum is σ = 26948013632. Its totient is φ = 13474006812.

The previous prime is 20211010187. The next prime is 20211010231. The reversal of 20211010221 is 12201011202.

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 not a de Polignac number, because 20211010221 - 2⁷ = 20211010093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211010197 and 20211010206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211010231) 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, 3368501701 + ... + 3368501706.

It is an arithmetic number, because the mean of its divisors is an integer number (6737003408).

Almost surely, 2^20211010221 is an apocalyptic number.

It is an amenable number.

20211010221 is a deficient number, since it is larger than the sum of its proper divisors (6737003411).

20211010221 is an equidigital number, since it uses as much as digits as its factorization.

20211010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6737003410.

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

Adding to 20211010221 its reverse (12201011202), we get a palindrome (32412021423).

The spelling of 20211010221 in words is "twenty billion, two hundred eleven million, ten thousand, two hundred twenty-one".