21022342 has 16 divisors (see below), whose sum is σ = 34744464. Its totient is φ = 9460000.

The previous prime is 21022279. The next prime is 21022357. The reversal of 21022342 is 24322012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2509 + ... + 6952.

It is an arithmetic number, because the mean of its divisors is an integer number (2171529).

Almost surely, 2^21022342 is an apocalyptic number.

21022342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21022342 is a deficient number, since it is larger than the sum of its proper divisors (13722122).

21022342 is a wasteful number, since it uses less digits than its factorization.

21022342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9575.

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

The square root of 21022342 is about 4585.0127589790. The cubic root of 21022342 is about 275.9902240464.

Adding to 21022342 its reverse (24322012), we get a palindrome (45344354).

It can be divided in two parts, 2102 and 2342, that added together give a palindrome (4444).

The spelling of 21022342 in words is "twenty-one million, twenty-two thousand, three hundred forty-two".