21220001220101 has 16 divisors (see below), whose sum is σ = 22397225543040. Its totient is φ = 20048887756800.

The previous prime is 21220001220097. The next prime is 21220001220151. The reversal of 21220001220101 is 10102210002212.

It is a cyclic number.

It is not a de Polignac number, because 21220001220101 - 2² = 21220001220097 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 (21220001220151) 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, 9515501 + ... + 11531901.

It is an arithmetic number, because the mean of its divisors is an integer number (1399826596440).

Almost surely, 2^{21220001220101} is an apocalyptic number.

It is an amenable number.

21220001220101 is a deficient number, since it is larger than the sum of its proper divisors (1177224322939).

21220001220101 is a wasteful number, since it uses less digits than its factorization.

21220001220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017916.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21220001220101 its reverse (10102210002212), we get a palindrome (31322211222313).

The spelling of 21220001220101 in words is "twenty-one trillion, two hundred twenty billion, one million, two hundred twenty thousand, one hundred one".