21374024 has 32 divisors (see below), whose sum is σ = 46267200. Its totient is φ = 9067200.

The previous prime is 21374021. The next prime is 21374029. The reversal of 21374024 is 42047312.

It is not an unprimeable number, because it can be changed into a prime (21374021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3767 + ... + 7545.

It is an arithmetic number, because the mean of its divisors is an integer number (1445850).

Almost surely, 2^21374024 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21374024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23133600).

21374024 is an abundant number, since it is smaller than the sum of its proper divisors (24893176).

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

21374024 is a wasteful number, since it uses less digits than its factorization.

21374024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3893 (or 3889 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 21374024 is about 4623.2049489505. The cubic root of 21374024 is about 277.5207310757.

The spelling of 21374024 in words is "twenty-one million, three hundred seventy-four thousand, twenty-four".