21342174 has 64 divisors (see below), whose sum is σ = 52503552. Its totient is φ = 5644800.

The previous prime is 21342169. The next prime is 21342179. The reversal of 21342174 is 47124312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21342169) and next prime (21342179).

It is a super-3 number, since 3×21342174³ (a number of 23 digits) contains 333 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 (21342179) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50484 + ... + 50904.

It is an arithmetic number, because the mean of its divisors is an integer number (820368).

Almost surely, 2^21342174 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21342174, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26251776).

21342174 is an abundant number, since it is smaller than the sum of its proper divisors (31161378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21342174 is a wasteful number, since it uses less digits than its factorization.

21342174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521.

The product of its digits is 1344, while the sum is 24.

The square root of 21342174 is about 4619.7590846277. The cubic root of 21342174 is about 277.3828155488.

Adding to 21342174 its reverse (47124312), we get a palindrome (68466486).

The spelling of 21342174 in words is "twenty-one million, three hundred forty-two thousand, one hundred seventy-four".