21293948 has 12 divisors (see below), whose sum is σ = 40131000. Its totient is φ = 9827952.

The previous prime is 21293947. The next prime is 21293953. The reversal of 21293948 is 84939212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21293947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204698 + ... + 204801.

It is an arithmetic number, because the mean of its divisors is an integer number (3344250).

Almost surely, 2^21293948 is an apocalyptic number.

It is an amenable number.

21293948 is a deficient number, since it is larger than the sum of its proper divisors (18837052).

21293948 is a wasteful number, since it uses less digits than its factorization.

21293948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409516 (or 409514 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 21293948 is about 4614.5365964526. The cubic root of 21293948 is about 277.1737279430.

The spelling of 21293948 in words is "twenty-one million, two hundred ninety-three thousand, nine hundred forty-eight".