21082270 has 16 divisors (see below), whose sum is σ = 41398128. Its totient is φ = 7666240.

The previous prime is 21082253. The next prime is 21082277. The reversal of 21082270 is 7228012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95719 + ... + 95938.

It is an arithmetic number, because the mean of its divisors is an integer number (2587383).

Almost surely, 2^21082270 is an apocalyptic number.

21082270 is a deficient number, since it is larger than the sum of its proper divisors (20315858).

21082270 is a wasteful number, since it uses less digits than its factorization.

21082270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191675.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 21082270 is about 4591.5433135276. The cubic root of 21082270 is about 276.2522286424.

The spelling of 21082270 in words is "twenty-one million, eighty-two thousand, two hundred seventy".