21253150 has 24 divisors (see below), whose sum is σ = 41251824. Its totient is φ = 8131200.

The previous prime is 21253121. The next prime is 21253181. The reversal of 21253150 is 5135212.

It is a congruent number.

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, 8091 + ... + 10390.

It is an arithmetic number, because the mean of its divisors is an integer number (1718826).

Almost surely, 2^21253150 is an apocalyptic number.

21253150 is a deficient number, since it is larger than the sum of its proper divisors (19998674).

21253150 is a wasteful number, since it uses less digits than its factorization.

21253150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18516 (or 18511 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21253150 is about 4610.1138814567. The cubic root of 21253150 is about 276.9965983760.

Adding to 21253150 its reverse (5135212), we get a palindrome (26388362).

The spelling of 21253150 in words is "twenty-one million, two hundred fifty-three thousand, one hundred fifty".