21376242 has 24 divisors (see below), whose sum is σ = 49040316. Its totient is φ = 6706176.

The previous prime is 21376217. The next prime is 21376253. The reversal of 21376242 is 24267312.

21376242 is a `hidden beast` number, since 2 + 1 + 37 + 624 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21261321 + 114921 = 4611^2 + 339^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34623 + ... + 35234.

Almost surely, 2^21376242 is an apocalyptic number.

21376242 is an abundant number, since it is smaller than the sum of its proper divisors (27664074).

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

21376242 is a wasteful number, since it uses less digits than its factorization.

21376242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69882 (or 69879 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 21376242 is about 4623.4448196123. Note that the first 3 decimals coincide. The cubic root of 21376242 is about 277.5303302617.

The spelling of 21376242 in words is "twenty-one million, three hundred seventy-six thousand, two hundred forty-two".