21210696 has 192 divisors, whose sum is σ = 69189120. Its totient is φ = 5806080.

The previous prime is 21210691. The next prime is 21210697. The reversal of 21210696 is 69601212.

21210696 is nontrivially palindromic in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210691) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 493251 + ... + 493293.

It is an arithmetic number, because the mean of its divisors is an integer number (360360).

Almost surely, 2^21210696 is an apocalyptic number.

21210696 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34594560).

21210696 is an abundant number, since it is smaller than the sum of its proper divisors (47978424).

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

21210696 is a wasteful number, since it uses less digits than its factorization.

21210696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21210696 is about 4605.5071381988. The cubic root of 21210696 is about 276.8120382460.

The spelling of 21210696 in words is "twenty-one million, two hundred ten thousand, six hundred ninety-six".