21253352 has 32 divisors (see below), whose sum is σ = 42113280. Its totient is φ = 10039680.

The previous prime is 21253339. The next prime is 21253361. The reversal of 21253352 is 25335212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9668 + ... + 11660.

It is an arithmetic number, because the mean of its divisors is an integer number (1316040).

Almost surely, 2^21253352 is an apocalyptic number.

It is an amenable number.

21253352 is a deficient number, since it is larger than the sum of its proper divisors (20859928).

21253352 is a wasteful number, since it uses less digits than its factorization.

21253352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073 (or 2069 counting only the distinct ones).

The product of its digits is 1800, while the sum is 23.

The square root of 21253352 is about 4610.1357897572. The cubic root of 21253352 is about 276.9974759422.

Adding to 21253352 its reverse (25335212), we get a palindrome (46588564).

The spelling of 21253352 in words is "twenty-one million, two hundred fifty-three thousand, three hundred fifty-two".