21031274 has 8 divisors (see below), whose sum is σ = 34414848. Its totient is φ = 9559660.

The previous prime is 21031253. The next prime is 21031277. The reversal of 21031274 is 47213012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21031277) 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 3 ways as a sum of consecutive naturals, for example, 477962 + ... + 478005.

It is an arithmetic number, because the mean of its divisors is an integer number (4301856).

Almost surely, 2^21031274 is an apocalyptic number.

21031274 is a deficient number, since it is larger than the sum of its proper divisors (13383574).

21031274 is a wasteful number, since it uses less digits than its factorization.

21031274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955980.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21031274 is about 4585.9866986288. The cubic root of 21031274 is about 276.0293062069.

Adding to 21031274 its reverse (47213012), we get a palindrome (68244286).

The spelling of 21031274 in words is "twenty-one million, thirty-one thousand, two hundred seventy-four".