21954744 has 120 divisors (see below), whose sum is σ = 69912960. Its totient is φ = 6223392.

The previous prime is 21954731. The next prime is 21954763. The reversal of 21954744 is 44745912.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21954699 and 21954708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 172809 + ... + 172935.

It is an arithmetic number, because the mean of its divisors is an integer number (582608).

Almost surely, 2^21954744 is an apocalyptic number.

21954744 is a gapful number since it is divisible by the number (24) 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 21954744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34956480).

21954744 is an abundant number, since it is smaller than the sum of its proper divisors (47958216).

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

21954744 is a wasteful number, since it uses less digits than its factorization.

21954744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 139 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 21954744 is about 4685.5889704497. The cubic root of 21954744 is about 280.0116661806.

The spelling of 21954744 in words is "twenty-one million, nine hundred fifty-four thousand, seven hundred forty-four".