21460842 has 64 divisors (see below), whose sum is σ = 54096000. Its totient is φ = 6251904.

The previous prime is 21460793. The next prime is 21460843. The reversal of 21460842 is 24806412.

21460842 is a `hidden beast` number, since 2 + 14 + 608 + 42 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21460843) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12534 + ... + 14142.

It is an arithmetic number, because the mean of its divisors is an integer number (845250).

Almost surely, 2^21460842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21460842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27048000).

21460842 is an abundant number, since it is smaller than the sum of its proper divisors (32635158).

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

21460842 is a wasteful number, since it uses less digits than its factorization.

21460842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652 (or 1646 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 21460842 is about 4632.5848076425. The cubic root of 21460842 is about 277.8959723262.

The spelling of 21460842 in words is "twenty-one million, four hundred sixty thousand, eight hundred forty-two".