21220102101 has 64 divisors (see below), whose sum is σ = 33549926400. Its totient is φ = 11789971200.

The previous prime is 21220102097. The next prime is 21220102129. The reversal of 21220102101 is 10120102212.

It is not a de Polignac number, because 21220102101 - 2² = 21220102097 is a prime.

It is a super-2 number, since 2×21220102101² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220102171) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4428615 + ... + 4433403.

It is an arithmetic number, because the mean of its divisors is an integer number (524217600).

Almost surely, 2^21220102101 is an apocalyptic number.

It is an amenable number.

21220102101 is a deficient number, since it is larger than the sum of its proper divisors (12329824299).

21220102101 is a wasteful number, since it uses less digits than its factorization.

21220102101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5050.

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

Adding to 21220102101 its reverse (10120102212), we get a palindrome (31340204313).

It can be divided in two parts, 21220 and 102101, that added together give a palindrome (123321).

The spelling of 21220102101 in words is "twenty-one billion, two hundred twenty million, one hundred two thousand, one hundred one".