87143021 has 12 divisors (see below), whose sum is σ = 105779232. Its totient is φ = 71445528.

The previous prime is 87143011. The next prime is 87143027. The reversal of 87143021 is 12034178.

It is not a de Polignac number, because 87143021 - 2²² = 82948717 is a prime.

It is a super-2 number, since 2×87143021² = 15187812218012882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87143027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37535 + ... + 39788.

It is an arithmetic number, because the mean of its divisors is an integer number (8814936).

Almost surely, 2^87143021 is an apocalyptic number.

It is an amenable number.

87143021 is a deficient number, since it is larger than the sum of its proper divisors (18636211).

87143021 is a wasteful number, since it uses less digits than its factorization.

87143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77360 (or 77353 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 87143021 is about 9335.0426351463. The cubic root of 87143021 is about 443.3474387633.

Adding to 87143021 its reverse (12034178), we get a palindrome (99177199).

The spelling of 87143021 in words is "eighty-seven million, one hundred forty-three thousand, twenty-one".