21423022 has 4 divisors (see below), whose sum is σ = 32134536. Its totient is φ = 10711510.

The previous prime is 21423019. The next prime is 21423053. The reversal of 21423022 is 22032412.

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

It is a super-2 number, since 2×21423022² = 917891743224968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21422987 and 21423005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5355754 + ... + 5355757.

It is an arithmetic number, because the mean of its divisors is an integer number (8033634).

Almost surely, 2^21423022 is an apocalyptic number.

21423022 is a deficient number, since it is larger than the sum of its proper divisors (10711514).

21423022 is a wasteful number, since it uses less digits than its factorization.

21423022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10711513.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21423022 is about 4628.5010532569. The cubic root of 21423022 is about 277.7326328886.

Adding to 21423022 its reverse (22032412), we get a palindrome (43455434).

The spelling of 21423022 in words is "twenty-one million, four hundred twenty-three thousand, twenty-two".