21471374 has 16 divisors (see below), whose sum is σ = 35585568. Its totient is φ = 9664512.

The previous prime is 21471371. The next prime is 21471377. The reversal of 21471374 is 47317412.

It is an interprime number because it is at equal distance from previous prime (21471371) and next prime (21471377).

It is a super-2 number, since 2×21471374² = 922039802895752, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471371) 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, 12947 + ... + 14510.

It is an arithmetic number, because the mean of its divisors is an integer number (2224098).

Almost surely, 2^21471374 is an apocalyptic number.

21471374 is a deficient number, since it is larger than the sum of its proper divisors (14114194).

21471374 is a wasteful number, since it uses less digits than its factorization.

21471374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27499.

The product of its digits is 4704, while the sum is 29.

The square root of 21471374 is about 4633.7213986169. The cubic root of 21471374 is about 277.9414244374.

Adding to 21471374 its reverse (47317412), we get a palindrome (68788786).

The spelling of 21471374 in words is "twenty-one million, four hundred seventy-one thousand, three hundred seventy-four".