21480174 has 32 divisors (see below), whose sum is σ = 48523680. Its totient is φ = 7041600.

The previous prime is 21480167. The next prime is 21480181. The reversal of 21480174 is 47108412.

It is an interprime number because it is at equal distance from previous prime (21480167) and next prime (21480181).

It is a super-2 number, since 2×21480174² = 922795750140552, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34 + ... + 6554.

It is an arithmetic number, because the mean of its divisors is an integer number (1516365).

Almost surely, 2^21480174 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21480174, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24261840).

21480174 is an abundant number, since it is smaller than the sum of its proper divisors (27043506).

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

21480174 is a wasteful number, since it uses less digits than its factorization.

21480174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6593 (or 6587 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 21480174 is about 4634.6708621001. The cubic root of 21480174 is about 277.9793904981.

Adding to 21480174 its reverse (47108412), we get a palindrome (68588586).

The spelling of 21480174 in words is "twenty-one million, four hundred eighty thousand, one hundred seventy-four".