21415352 has 24 divisors (see below), whose sum is σ = 46710360. Its totient is φ = 9177840.

The previous prime is 21415351. The next prime is 21415357. The reversal of 21415352 is 25351412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21415351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26924 + ... + 27707.

It is an arithmetic number, because the mean of its divisors is an integer number (1946265).

Almost surely, 2^21415352 is an apocalyptic number.

It is an amenable number.

21415352 is an abundant number, since it is smaller than the sum of its proper divisors (25295008).

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

21415352 is a wasteful number, since it uses less digits than its factorization.

21415352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54651 (or 54640 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 21415352 is about 4627.6724171013. The cubic root of 21415352 is about 277.6994837594.

Adding to 21415352 its reverse (25351412), we get a palindrome (46766764).

The spelling of 21415352 in words is "twenty-one million, four hundred fifteen thousand, three hundred fifty-two".