21023121422 has 8 divisors (see below), whose sum is σ = 31629954072. Its totient is φ = 10479803400.

The previous prime is 21023121421. The next prime is 21023121439. The reversal of 21023121422 is 22412132012.

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 = 21023121394 and 21023121403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023121421) 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, 15877829 + ... + 15879152.

It is an arithmetic number, because the mean of its divisors is an integer number (3953744259).

Almost surely, 2^21023121422 is an apocalyptic number.

21023121422 is a deficient number, since it is larger than the sum of its proper divisors (10606832650).

21023121422 is a wasteful number, since it uses less digits than its factorization.

21023121422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31757314.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21023121422 its reverse (22412132012), we get a palindrome (43435253434).

The spelling of 21023121422 in words is "twenty-one billion, twenty-three million, one hundred twenty-one thousand, four hundred twenty-two".