21220210122101 has 16 divisors (see below), whose sum is σ = 21310221576384. Its totient is φ = 21130433764224.

The previous prime is 21220210122071. The next prime is 21220210122157. The reversal of 21220210122101 is 10122101202212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220210122101 is a prime.

It is a super-2 number, since 2×21220210122101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21220210122101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220210142101) 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, 463128545 + ... + 463174361.

It is an arithmetic number, because the mean of its divisors is an integer number (1331888848524).

Almost surely, 2^{21220210122101} is an apocalyptic number.

It is an amenable number.

21220210122101 is a deficient number, since it is larger than the sum of its proper divisors (90011454283).

21220210122101 is a wasteful number, since it uses less digits than its factorization.

21220210122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48340.

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

Adding to 21220210122101 its reverse (10122101202212), we get a palindrome (31342311324313).

The spelling of 21220210122101 in words is "twenty-one trillion, two hundred twenty billion, two hundred ten million, one hundred twenty-two thousand, one hundred one".