21220022101 has 4 divisors (see below), whose sum is σ = 21220856704. Its totient is φ = 21219187500.

The previous prime is 21220022077. The next prime is 21220022119. The reversal of 21220022101 is 10122002212.

It is a happy number.

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 21220022101 - 2¹¹ = 21220020053 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 (21220032101) 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, 377925 + ... + 430426.

It is an arithmetic number, because the mean of its divisors is an integer number (5305214176).

Almost surely, 2^21220022101 is an apocalyptic number.

It is an amenable number.

21220022101 is a deficient number, since it is larger than the sum of its proper divisors (834603).

21220022101 is an equidigital number, since it uses as much as digits as its factorization.

21220022101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834602.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21220022101 its reverse (10122002212), we get a palindrome (31342024313).

The spelling of 21220022101 in words is "twenty-one billion, two hundred twenty million, twenty-two thousand, one hundred one".