21143358 has 48 divisors (see below), whose sum is σ = 47773440. Its totient is φ = 6752592.

The previous prime is 21143357. The next prime is 21143363. The reversal of 21143358 is 85334112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143357) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45435 + ... + 45897.

It is an arithmetic number, because the mean of its divisors is an integer number (995280).

Almost surely, 2^21143358 is an apocalyptic number.

21143358 is an abundant number, since it is smaller than the sum of its proper divisors (26630082).

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

21143358 is a wasteful number, since it uses less digits than its factorization.

21143358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 570 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 21143358 is about 4598.1907311463. The cubic root of 21143358 is about 276.5187942234.

The spelling of 21143358 in words is "twenty-one million, one hundred forty-three thousand, three hundred fifty-eight".