20111010221 has 8 divisors (see below), whose sum is σ = 20144536800. Its totient is φ = 20077508880.

The previous prime is 20111010203. The next prime is 20111010289. The reversal of 20111010221 is 12201011102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111010221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111010121) 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, 2176391 + ... + 2185611.

It is an arithmetic number, because the mean of its divisors is an integer number (2518067100).

Almost surely, 2^20111010221 is an apocalyptic number.

It is an amenable number.

20111010221 is a deficient number, since it is larger than the sum of its proper divisors (33526579).

20111010221 is an equidigital number, since it uses as much as digits as its factorization.

20111010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12619.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20111010221 its reverse (12201011102), we get a palindrome (32312021323).

The spelling of 20111010221 in words is "twenty billion, one hundred eleven million, ten thousand, two hundred twenty-one".