21571352 has 16 divisors (see below), whose sum is σ = 44123400. Its totient is φ = 9805120.

The previous prime is 21571343. The next prime is 21571357. The reversal of 21571352 is 25317512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21571357) 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, 122477 + ... + 122652.

Almost surely, 2^21571352 is an apocalyptic number.

21571352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21571352 is an abundant number, since it is smaller than the sum of its proper divisors (22552048).

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

21571352 is a wasteful number, since it uses less digits than its factorization.

21571352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245146 (or 245142 counting only the distinct ones).

The product of its digits is 2100, while the sum is 26.

The square root of 21571352 is about 4644.4969587674. The cubic root of 21571352 is about 278.3721531028.

Adding to 21571352 its reverse (25317512), we get a palindrome (46888864).

The spelling of 21571352 in words is "twenty-one million, five hundred seventy-one thousand, three hundred fifty-two".