21222021101 has 4 divisors (see below), whose sum is σ = 22338969600. Its totient is φ = 20105072604.

The previous prime is 21222021071. The next prime is 21222021103. The reversal of 21222021101 is 10112022212.

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 not a de Polignac number, because 21222021101 - 2¹⁰ = 21222020077 is a prime.

It is a super-2 number, since 2×21222021101² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222021103) 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, 558474221 + ... + 558474258.

It is an arithmetic number, because the mean of its divisors is an integer number (5584742400).

Almost surely, 2^21222021101 is an apocalyptic number.

It is an amenable number.

21222021101 is a deficient number, since it is larger than the sum of its proper divisors (1116948499).

21222021101 is a wasteful number, since it uses less digits than its factorization.

21222021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116948498.

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

Adding to 21222021101 its reverse (10112022212), we get a palindrome (31334043313).

The spelling of 21222021101 in words is "twenty-one billion, two hundred twenty-two million, twenty-one thousand, one hundred one".