21023422 has 8 divisors (see below), whose sum is σ = 36040176. Its totient is φ = 9010032.

The previous prime is 21023419. The next prime is 21023459. The reversal of 21023422 is 22432012.

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 = 21023396 and 21023405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750823 + ... + 750850.

It is an arithmetic number, because the mean of its divisors is an integer number (4505022).

Almost surely, 2^21023422 is an apocalyptic number.

21023422 is a deficient number, since it is larger than the sum of its proper divisors (15016754).

21023422 is a wasteful number, since it uses less digits than its factorization.

21023422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501682.

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

The square root of 21023422 is about 4585.1305324930. The cubic root of 21023422 is about 275.9949501982.

Adding to 21023422 its reverse (22432012), we get a palindrome (43455434).

It can be divided in two parts, 210 and 23422, that added together give a palindrome (23632).

The spelling of 21023422 in words is "twenty-one million, twenty-three thousand, four hundred twenty-two".