21796270 has 32 divisors (see below), whose sum is σ = 40515552. Its totient is φ = 8437632.

The previous prime is 21796253. The next prime is 21796279. The reversal of 21796270 is 7269712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74244 + ... + 74536.

It is an arithmetic number, because the mean of its divisors is an integer number (1266111).

Almost surely, 2^21796270 is an apocalyptic number.

21796270 is a deficient number, since it is larger than the sum of its proper divisors (18719282).

21796270 is a wasteful number, since it uses less digits than its factorization.

21796270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 21796270 is about 4668.6475557703. The cubic root of 21796270 is about 279.3363107409.

It can be divided in two parts, 2 and 1796270, that multiplied together give a triangular number (3592540 = T₂₆₈₀).

The spelling of 21796270 in words is "twenty-one million, seven hundred ninety-six thousand, two hundred seventy".