21096884 has 6 divisors (see below), whose sum is σ = 36919554. Its totient is φ = 10548440.

The previous prime is 21096883. The next prime is 21096913. The reversal of 21096884 is 48869012.

It can be written as a sum of positive squares in only one way, i.e., 20702500 + 394384 = 4550^2 + 628^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21096883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2637107 + ... + 2637114.

It is an arithmetic number, because the mean of its divisors is an integer number (6153259).

Almost surely, 2^21096884 is an apocalyptic number.

It is an amenable number.

21096884 is a deficient number, since it is larger than the sum of its proper divisors (15822670).

21096884 is a wasteful number, since it uses less digits than its factorization.

21096884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5274225 (or 5274223 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 21096884 is about 4593.1344417511. The cubic root of 21096884 is about 276.3160455778.

The spelling of 21096884 in words is "twenty-one million, ninety-six thousand, eight hundred eighty-four".