21151472 has 20 divisors (see below), whose sum is σ = 41053920. Its totient is φ = 10556928.

The previous prime is 21151433. The next prime is 21151483. The reversal of 21151472 is 27415112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14153 + ... + 15575.

It is an arithmetic number, because the mean of its divisors is an integer number (2052696).

Almost surely, 2^21151472 is an apocalyptic number.

It is an amenable number.

21151472 is a deficient number, since it is larger than the sum of its proper divisors (19902448).

21151472 is a wasteful number, since it uses less digits than its factorization.

21151472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360 (or 2354 counting only the distinct ones).

The product of its digits is 560, while the sum is 23.

The square root of 21151472 is about 4599.0729500629. The cubic root of 21151472 is about 276.5541620924.

Adding to 21151472 its reverse (27415112), we get a palindrome (48566584).

The spelling of 21151472 in words is "twenty-one million, one hundred fifty-one thousand, four hundred seventy-two".