21469916 has 24 divisors (see below), whose sum is σ = 41559840. Its totient is φ = 9640512.

The previous prime is 21469901. The next prime is 21469919. The reversal of 21469916 is 61996412.

It is a self number, because there is not a number n which added to its sum of digits gives 21469916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21469919) 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, 3656 + ... + 7503.

It is an arithmetic number, because the mean of its divisors is an integer number (1731660).

Almost surely, 2^21469916 is an apocalyptic number.

21469916 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21469916 is a deficient number, since it is larger than the sum of its proper divisors (20089924).

21469916 is a wasteful number, since it uses less digits than its factorization.

21469916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11213 (or 11211 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 21469916 is about 4633.5640709933. The cubic root of 21469916 is about 277.9351331498.

The spelling of 21469916 in words is "twenty-one million, four hundred sixty-nine thousand, nine hundred sixteen".