21754746 has 48 divisors (see below), whose sum is σ = 52416000. Its totient is φ = 6475680.

The previous prime is 21754741. The next prime is 21754769. The reversal of 21754746 is 64745712.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21754746.

It is not an unprimeable number, because it can be changed into a prime (21754741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5755 + ... + 8753.

It is an arithmetic number, because the mean of its divisors is an integer number (1092000).

Almost surely, 2^21754746 is an apocalyptic number.

21754746 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21754746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26208000).

21754746 is an abundant number, since it is smaller than the sum of its proper divisors (30661254).

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

21754746 is a wasteful number, since it uses less digits than its factorization.

21754746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051 (or 3048 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 21754746 is about 4664.1983233992. The cubic root of 21754746 is about 279.1588104222.

It can be divided in two parts, 21754 and 746, that added together give a square (22500 = 150²).

The spelling of 21754746 in words is "twenty-one million, seven hundred fifty-four thousand, seven hundred forty-six".