21037143 has 8 divisors (see below), whose sum is σ = 29699568. Its totient is φ = 13199744.

The previous prime is 21037139. The next prime is 21037171. The reversal of 21037143 is 34173012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21037143 - 2² = 21037139 is a prime.

It is a super-2 number, since 2×21037143² = 885122771204898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21037103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206196 + ... + 206297.

It is an arithmetic number, because the mean of its divisors is an integer number (3712446).

Almost surely, 2^21037143 is an apocalyptic number.

21037143 is a deficient number, since it is larger than the sum of its proper divisors (8662425).

21037143 is a wasteful number, since it uses less digits than its factorization.

21037143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412513.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21037143 is about 4586.6265380997. The cubic root of 21037143 is about 276.0549801204.

The spelling of 21037143 in words is "twenty-one million, thirty-seven thousand, one hundred forty-three".