21617196 has 12 divisors (see below), whose sum is σ = 50440152. Its totient is φ = 7205728.

The previous prime is 21617191. The next prime is 21617201. The reversal of 21617196 is 69171612.

It is an interprime number because it is at equal distance from previous prime (21617191) and next prime (21617201).

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21617191) 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, 900705 + ... + 900728.

It is an arithmetic number, because the mean of its divisors is an integer number (4203346).

Almost surely, 2^21617196 is an apocalyptic number.

It is an amenable number.

21617196 is an abundant number, since it is smaller than the sum of its proper divisors (28822956).

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

21617196 is a wasteful number, since it uses less digits than its factorization.

21617196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801440 (or 1801438 counting only the distinct ones).

The product of its digits is 4536, while the sum is 33.

The square root of 21617196 is about 4649.4296424400. The cubic root of 21617196 is about 278.5692148223.

The spelling of 21617196 in words is "twenty-one million, six hundred seventeen thousand, one hundred ninety-six".