21220101210101 has 16 divisors (see below), whose sum is σ = 23158319344128. Its totient is φ = 19367769926400.

The previous prime is 21220101210089. The next prime is 21220101210127. The reversal of 21220101210101 is 10101210102212.

It is a cyclic number.

It is not a de Polignac number, because 21220101210101 - 2¹⁰ = 21220101209077 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 (21220101270101) 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, 144031805 + ... + 144179058.

It is an arithmetic number, because the mean of its divisors is an integer number (1447394959008).

Almost surely, 2^{21220101210101} is an apocalyptic number.

It is an amenable number.

21220101210101 is a deficient number, since it is larger than the sum of its proper divisors (1938218134027).

21220101210101 is a wasteful number, since it uses less digits than its factorization.

21220101210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288211012.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21220101210101 its reverse (10101210102212), we get a palindrome (31321311312313).

The spelling of 21220101210101 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, two hundred ten thousand, one hundred one".