21048461 has 8 divisors (see below), whose sum is σ = 24885120. Its totient is φ = 17419248.

The previous prime is 21048451. The next prime is 21048479. The reversal of 21048461 is 16484012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21048461 - 2¹⁸ = 20786317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21048461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21048421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51641 + ... + 52046.

It is an arithmetic number, because the mean of its divisors is an integer number (3110640).

Almost surely, 2^21048461 is an apocalyptic number.

It is an amenable number.

21048461 is a deficient number, since it is larger than the sum of its proper divisors (3836659).

21048461 is a wasteful number, since it uses less digits than its factorization.

21048461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103723.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21048461 is about 4587.8601765965. The cubic root of 21048461 is about 276.1044771793.

The spelling of 21048461 in words is "twenty-one million, forty-eight thousand, four hundred sixty-one".