21946270 has 16 divisors (see below), whose sum is σ = 39677040. Its totient is φ = 8739904.

The previous prime is 21946259. The next prime is 21946271. The reversal of 21946270 is 7264912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21946271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2380 + ... + 7039.

It is an arithmetic number, because the mean of its divisors is an integer number (2479815).

Almost surely, 2^21946270 is an apocalyptic number.

21946270 is a deficient number, since it is larger than the sum of its proper divisors (17730770).

21946270 is a wasteful number, since it uses less digits than its factorization.

21946270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9659.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21946270 is about 4684.6846211885. The cubic root of 21946270 is about 279.9756356351.

It can be divided in two parts, 2194 and 6270, that added together give a square (8464 = 92²).

The spelling of 21946270 in words is "twenty-one million, nine hundred forty-six thousand, two hundred seventy".