21220024022 has 4 divisors (see below), whose sum is σ = 31830036036. Its totient is φ = 10610012010.

The previous prime is 21220024009. The next prime is 21220024027. The reversal of 21220024022 is 22042002212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220024027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305006004 + ... + 5305006007.

It is an arithmetic number, because the mean of its divisors is an integer number (7957509009).

Almost surely, 2^21220024022 is an apocalyptic number.

21220024022 is a deficient number, since it is larger than the sum of its proper divisors (10610012014).

21220024022 is a wasteful number, since it uses less digits than its factorization.

21220024022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610012013.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 21220024022 its reverse (22042002212), we get a palindrome (43262026234).

The spelling of 21220024022 in words is "twenty-one billion, two hundred twenty million, twenty-four thousand, twenty-two".