21971096 has 64 divisors (see below), whose sum is σ = 49593600. Its totient is φ = 8926848.

The previous prime is 21971083. The next prime is 21971107. The reversal of 21971096 is 69017912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134711 + ... + 134873.

It is an arithmetic number, because the mean of its divisors is an integer number (774900).

Almost surely, 2^21971096 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21971096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24796800).

21971096 is an abundant number, since it is smaller than the sum of its proper divisors (27622504).

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

21971096 is a wasteful number, since it uses less digits than its factorization.

21971096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 21971096 is about 4687.3335703788. Note that the first 3 decimals coincide. The cubic root of 21971096 is about 280.0811669451.

The spelling of 21971096 in words is "twenty-one million, nine hundred seventy-one thousand, ninety-six".