21522342223 has 4 divisors (see below), whose sum is σ = 21523370400. Its totient is φ = 21521314048.

The previous prime is 21522342221. The next prime is 21522342427. The reversal of 21522342223 is 32224322512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21522342223 - 2¹ = 21522342221 is a prime.

It is a super-2 number, since 2×21522342223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21522342191 and 21522342200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522342221) 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, 482023 + ... + 524776.

It is an arithmetic number, because the mean of its divisors is an integer number (5380842600).

Almost surely, 2^21522342223 is an apocalyptic number.

21522342223 is a deficient number, since it is larger than the sum of its proper divisors (1028177).

21522342223 is a wasteful number, since it uses less digits than its factorization.

21522342223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028176.

The product of its digits is 11520, while the sum is 28.

Adding to 21522342223 its reverse (32224322512), we get a palindrome (53746664735).

The spelling of 21522342223 in words is "twenty-one billion, five hundred twenty-two million, three hundred forty-two thousand, two hundred twenty-three".