21261048 has 32 divisors (see below), whose sum is σ = 53298000. Its totient is φ = 7067648.

The previous prime is 21261041. The next prime is 21261059. The reversal of 21261048 is 84016212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21261041) 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, 9790 + ... + 11762.

Almost surely, 2^21261048 is an apocalyptic number.

It is an amenable number.

21261048 is an abundant number, since it is smaller than the sum of its proper divisors (32036952).

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

21261048 is a wasteful number, since it uses less digits than its factorization.

21261048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431 (or 2427 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21261048 is about 4610.9703967820. The cubic root of 21261048 is about 277.0309062032.

The spelling of 21261048 in words is "twenty-one million, two hundred sixty-one thousand, forty-eight".