21919016 has 32 divisors (see below), whose sum is σ = 47183040. Its totient is φ = 9351168.

The previous prime is 21919013. The next prime is 21919019. The reversal of 21919016 is 61091912.

It is an interprime number because it is at equal distance from previous prime (21919013) and next prime (21919019).

It is a self number, because there is not a number n which added to its sum of digits gives 21919016.

It is not an unprimeable number, because it can be changed into a prime (21919013) 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, 13631 + ... + 15153.

It is an arithmetic number, because the mean of its divisors is an integer number (1474470).

Almost surely, 2^21919016 is an apocalyptic number.

It is an amenable number.

21919016 is an abundant number, since it is smaller than the sum of its proper divisors (25264024).

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

21919016 is a wasteful number, since it uses less digits than its factorization.

21919016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793 (or 1789 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 21919016 is about 4681.7748771166. The cubic root of 21919016 is about 279.8596916078.

The spelling of 21919016 in words is "twenty-one million, nine hundred nineteen thousand, sixteen".