21464730 has 128 divisors (see below), whose sum is σ = 67253760. Its totient is φ = 4769280.

The previous prime is 21464719. The next prime is 21464777. The reversal of 21464730 is 3746412.

21464730 is a `hidden beast` number, since 2 + 14 + 647 + 3 + 0 = 666.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21464694 and 21464703.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77352 + ... + 77628.

It is an arithmetic number, because the mean of its divisors is an integer number (525420).

Almost surely, 2^21464730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21464730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33626880).

21464730 is an abundant number, since it is smaller than the sum of its proper divisors (45789030).

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

21464730 is a wasteful number, since it uses less digits than its factorization.

21464730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 21464730 is about 4633.0044247766. The cubic root of 21464730 is about 277.9127531885.

The spelling of 21464730 in words is "twenty-one million, four hundred sixty-four thousand, seven hundred thirty".