21220101222101 has 4 divisors (see below), whose sum is σ = 21221098288032. Its totient is φ = 21219104156172.

The previous prime is 21220101222077. The next prime is 21220101222113. The reversal of 21220101222101 is 10122210102212.

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 a cyclic number.

It is not a de Polignac number, because 21220101222101 - 2⁴² = 16822054710997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21220101222101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220101252101) 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, 498501041 + ... + 498543606.

It is an arithmetic number, because the mean of its divisors is an integer number (5305274572008).

Almost surely, 2^{21220101222101} is an apocalyptic number.

It is an amenable number.

21220101222101 is a deficient number, since it is larger than the sum of its proper divisors (997065931).

21220101222101 is an equidigital number, since it uses as much as digits as its factorization.

21220101222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997065930.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220101222101 its reverse (10122210102212), we get a palindrome (31342311324313).

The spelling of 21220101222101 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, two hundred twenty-two thousand, one hundred one".