21143152 has 10 divisors (see below), whose sum is σ = 40964888. Its totient is φ = 10571568.

The previous prime is 21143137. The next prime is 21143179. The reversal of 21143152 is 25134112.

It is a super-3 number, since 3×21143152³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660708 + ... + 660739.

Almost surely, 2^21143152 is an apocalyptic number.

It is an amenable number.

21143152 is a deficient number, since it is larger than the sum of its proper divisors (19821736).

21143152 is a wasteful number, since it uses less digits than its factorization.

21143152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321455 (or 1321449 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 21143152 is about 4598.1683309770. The cubic root of 21143152 is about 276.5178961785.

Adding to 21143152 its reverse (25134112), we get a palindrome (46277264).

The spelling of 21143152 in words is "twenty-one million, one hundred forty-three thousand, one hundred fifty-two".