21735340 has 48 divisors (see below), whose sum is σ = 51416064. Its totient is φ = 7646400.

The previous prime is 21735331. The next prime is 21735341. The reversal of 21735340 is 4353712.

It is not an unprimeable number, because it can be changed into a prime (21735341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5227 + ... + 8413.

It is an arithmetic number, because the mean of its divisors is an integer number (1071168).

Almost surely, 2^21735340 is an apocalyptic number.

21735340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21735340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25708032).

21735340 is an abundant number, since it is smaller than the sum of its proper divisors (29680724).

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

21735340 is a wasteful number, since it uses less digits than its factorization.

21735340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238 (or 3236 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 21735340 is about 4662.1175446357. The cubic root of 21735340 is about 279.0757792299.

The spelling of 21735340 in words is "twenty-one million, seven hundred thirty-five thousand, three hundred forty".