21261848 has 8 divisors (see below), whose sum is σ = 39865980. Its totient is φ = 10630920.

The previous prime is 21261839. The next prime is 21261869. The reversal of 21261848 is 84816212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328858 + ... + 1328873.

Almost surely, 2^21261848 is an apocalyptic number.

It is an amenable number.

21261848 is a deficient number, since it is larger than the sum of its proper divisors (18604132).

21261848 is a wasteful number, since it uses less digits than its factorization.

21261848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2657737 (or 2657733 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 21261848 is about 4611.0571456012. The cubic root of 21261848 is about 277.0343808194.

The spelling of 21261848 in words is "twenty-one million, two hundred sixty-one thousand, eight hundred forty-eight".