21143488 has 28 divisors (see below), whose sum is σ = 43314112. Its totient is φ = 10229760.

The previous prime is 21143483. The next prime is 21143489. The reversal of 21143488 is 88434112.

It is a super-2 number, since 2×21143488² = 894094169612288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143483) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 3345 + ... + 7312.

Almost surely, 2^21143488 is an apocalyptic number.

It is an amenable number.

21143488 is an abundant number, since it is smaller than the sum of its proper divisors (22170624).

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

21143488 is a wasteful number, since it uses less digits than its factorization.

21143488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10700 (or 10690 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

The square root of 21143488 is about 4598.2048671193. The cubic root of 21143488 is about 276.5193609478.

The spelling of 21143488 in words is "twenty-one million, one hundred forty-three thousand, four hundred eighty-eight".