21245948 has 6 divisors (see below), whose sum is σ = 37180416. Its totient is φ = 10622972.

The previous prime is 21245947. The next prime is 21245963. The reversal of 21245948 is 84954212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21245941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2655740 + ... + 2655747.

It is an arithmetic number, because the mean of its divisors is an integer number (6196736).

Almost surely, 2^21245948 is an apocalyptic number.

It is an amenable number.

21245948 is a deficient number, since it is larger than the sum of its proper divisors (15934468).

21245948 is a wasteful number, since it uses less digits than its factorization.

21245948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5311491 (or 5311489 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 21245948 is about 4609.3327065856. The cubic root of 21245948 is about 276.9653064674.

The spelling of 21245948 in words is "twenty-one million, two hundred forty-five thousand, nine hundred forty-eight".