21148242 has 16 divisors (see below), whose sum is σ = 42456960. Its totient is φ = 7022672.

The previous prime is 21148241. The next prime is 21148243. The reversal of 21148242 is 24284112.

It is an interprime number because it is at equal distance from previous prime (21148241) and next prime (21148243).

It is not an unprimeable number, because it can be changed into a prime (21148241) 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, 4938 + ... + 8165.

It is an arithmetic number, because the mean of its divisors is an integer number (2653560).

Almost surely, 2^21148242 is an apocalyptic number.

21148242 is an abundant number, since it is smaller than the sum of its proper divisors (21308718).

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

21148242 is a wasteful number, since it uses less digits than its factorization.

21148242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13377.

The product of its digits is 1024, while the sum is 24.

The square root of 21148242 is about 4598.7217789294. The cubic root of 21148242 is about 276.5400840270.

The spelling of 21148242 in words is "twenty-one million, one hundred forty-eight thousand, two hundred forty-two".