21222020101 has 4 divisors (see below), whose sum is σ = 21222484192. Its totient is φ = 21221556012.

The previous prime is 21222020089. The next prime is 21222020117. The reversal of 21222020101 is 10102022212.

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 21222020101 - 2¹⁵ = 21221987333 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 (21222030101) 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, 154905 + ... + 257758.

It is an arithmetic number, because the mean of its divisors is an integer number (5305621048).

Almost surely, 2^21222020101 is an apocalyptic number.

It is an amenable number.

21222020101 is a deficient number, since it is larger than the sum of its proper divisors (464091).

21222020101 is an equidigital number, since it uses as much as digits as its factorization.

21222020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464090.

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

Adding to 21222020101 its reverse (10102022212), we get a palindrome (31324042313).

The spelling of 21222020101 in words is "twenty-one billion, two hundred twenty-two million, twenty thousand, one hundred one".