21127796 has 6 divisors (see below), whose sum is σ = 36973650. Its totient is φ = 10563896.

The previous prime is 21127783. The next prime is 21127817. The reversal of 21127796 is 69772112.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 2292196 = 4340^2 + 1514^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2640971 + ... + 2640978.

It is an arithmetic number, because the mean of its divisors is an integer number (6162275).

Almost surely, 2^21127796 is an apocalyptic number.

It is an amenable number.

21127796 is a deficient number, since it is larger than the sum of its proper divisors (15845854).

21127796 is a wasteful number, since it uses less digits than its factorization.

21127796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5281953 (or 5281951 counting only the distinct ones).

The product of its digits is 10584, while the sum is 35.

The square root of 21127796 is about 4596.4982323504. The cubic root of 21127796 is about 276.4509361651.

Subtracting 21127796 from its reverse (69772112), we obtain a triangular number (48644316 = T₉₈₆₃).

The spelling of 21127796 in words is "twenty-one million, one hundred twenty-seven thousand, seven hundred ninety-six".