21220120101 has 16 divisors (see below), whose sum is σ = 28698582528. Its totient is φ = 13944294000.

The previous prime is 21220120087. The next prime is 21220120123. The reversal of 21220120101 is 10102102212.

It is not a de Polignac number, because 21220120101 - 2⁹ = 21220119589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220122101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1237750 + ... + 1254776.

It is an arithmetic number, because the mean of its divisors is an integer number (1793661408).

Almost surely, 2^21220120101 is an apocalyptic number.

It is an amenable number.

21220120101 is a deficient number, since it is larger than the sum of its proper divisors (7478462427).

21220120101 is a wasteful number, since it uses less digits than its factorization.

21220120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22952.

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

Adding to 21220120101 its reverse (10102102212), we get a palindrome (31322222313).

The spelling of 21220120101 in words is "twenty-one billion, two hundred twenty million, one hundred twenty thousand, one hundred one".