21442316 has 24 divisors (see below), whose sum is σ = 43696800. Its totient is φ = 9015552.

The previous prime is 21442313. The next prime is 21442319. The reversal of 21442316 is 61324412.

It is an interprime number because it is at equal distance from previous prime (21442313) and next prime (21442319).

It is a junction number, because it is equal to n+sod(n) for n = 21442291 and 21442300.

It is not an unprimeable number, because it can be changed into a prime (21442313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5741 + ... + 8708.

It is an arithmetic number, because the mean of its divisors is an integer number (1820700).

Almost surely, 2^21442316 is an apocalyptic number.

It is an amenable number.

21442316 is an abundant number, since it is smaller than the sum of its proper divisors (22254484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21442316 is a wasteful number, since it uses less digits than its factorization.

21442316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14513 (or 14511 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 21442316 is about 4630.5848442718. The cubic root of 21442316 is about 277.8159850497.

Adding to 21442316 its reverse (61324412), we get a palindrome (82766728).

The spelling of 21442316 in words is "twenty-one million, four hundred forty-two thousand, three hundred sixteen".