21143000 has 32 divisors (see below), whose sum is σ = 49476960. Its totient is φ = 8456800.

The previous prime is 21142981. The next prime is 21143009. The reversal of 21143000 is 34112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143009) 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, 9572 + ... + 11571.

It is an arithmetic number, because the mean of its divisors is an integer number (1546155).

Almost surely, 2^21143000 is an apocalyptic number.

21143000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21143000 is an abundant number, since it is smaller than the sum of its proper divisors (28333960).

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

21143000 is a wasteful number, since it uses less digits than its factorization.

21143000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21164 (or 21150 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21143000 is about 4598.1518026268. The cubic root of 21143000 is about 276.5172335396.

Adding to 21143000 its reverse (34112), we get a palindrome (21177112).

The spelling of 21143000 in words is "twenty-one million, one hundred forty-three thousand".