20101311221 has 8 divisors (see below), whose sum is σ = 20243277600. Its totient is φ = 19959439248.

The previous prime is 20101311157. The next prime is 20101311229. The reversal of 20101311221 is 12211310102.

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 20101311221 - 2⁶ = 20101311157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101311196 and 20101311205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101311229) 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, 434990 + ... + 478976.

It is an arithmetic number, because the mean of its divisors is an integer number (2530409700).

Almost surely, 2^20101311221 is an apocalyptic number.

It is an amenable number.

20101311221 is a deficient number, since it is larger than the sum of its proper divisors (141966379).

20101311221 is a wasteful number, since it uses less digits than its factorization.

20101311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47203.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20101311221 its reverse (12211310102), we get a palindrome (32312621323).

The spelling of 20101311221 in words is "twenty billion, one hundred one million, three hundred eleven thousand, two hundred twenty-one".