21234240022 has 8 divisors (see below), whose sum is σ = 32065128000. Its totient is φ = 10545864024.

The previous prime is 21234239977. The next prime is 21234240029. The reversal of 21234240022 is 22004243212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21234239975 and 21234240002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234240029) 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, 35627622 + ... + 35628217.

It is an arithmetic number, because the mean of its divisors is an integer number (4008141000).

Almost surely, 2^21234240022 is an apocalyptic number.

21234240022 is a deficient number, since it is larger than the sum of its proper divisors (10830887978).

21234240022 is a wasteful number, since it uses less digits than its factorization.

21234240022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71255990.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21234240022 its reverse (22004243212), we get a palindrome (43238483234).

The spelling of 21234240022 in words is "twenty-one billion, two hundred thirty-four million, two hundred forty thousand, twenty-two".