21371016 has 16 divisors (see below), whose sum is σ = 53427600. Its totient is φ = 7123664.

The previous prime is 21371011. The next prime is 21371027. The reversal of 21371016 is 61017312.

It is a junction number, because it is equal to n+sod(n) for n = 21370983 and 21371001.

It is not an unprimeable number, because it can be changed into a prime (21371011) 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, 445206 + ... + 445253.

It is an arithmetic number, because the mean of its divisors is an integer number (3339225).

Almost surely, 2^21371016 is an apocalyptic number.

It is an amenable number.

21371016 is an abundant number, since it is smaller than the sum of its proper divisors (32056584).

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

21371016 is a wasteful number, since it uses less digits than its factorization.

21371016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890468 (or 890464 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 21371016 is about 4622.8796220538. The cubic root of 21371016 is about 277.5077118220.

Adding to 21371016 its reverse (61017312), we get a palindrome (82388328).

The spelling of 21371016 in words is "twenty-one million, three hundred seventy-one thousand, sixteen".