21143862 has 16 divisors (see below), whose sum is σ = 46986480. Its totient is φ = 7047936.

The previous prime is 21143861. The next prime is 21143867. The reversal of 21143862 is 26834112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143861) 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, 195723 + ... + 195830.

It is an arithmetic number, because the mean of its divisors is an integer number (2936655).

Almost surely, 2^21143862 is an apocalyptic number.

21143862 is an abundant number, since it is smaller than the sum of its proper divisors (25842618).

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

21143862 is a wasteful number, since it uses less digits than its factorization.

21143862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391564 (or 391558 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21143862 is about 4598.2455349840. The cubic root of 21143862 is about 276.5209913573.

Adding to 21143862 its reverse (26834112), we get a palindrome (47977974).

The spelling of 21143862 in words is "twenty-one million, one hundred forty-three thousand, eight hundred sixty-two".