87021123 has 16 divisors (see below), whose sum is σ = 136882176. Its totient is φ = 48121920.

The previous prime is 87021119. The next prime is 87021127. The reversal of 87021123 is 32112078.

It is an interprime number because it is at equal distance from previous prime (87021119) and next prime (87021127).

It is not a de Polignac number, because 87021123 - 2² = 87021119 is a prime.

It is a super-2 number, since 2×87021123² = 15145351696362258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87021093 and 87021102.

It is not an unprimeable number, because it can be changed into a prime (87021127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66186 + ... + 67487.

It is an arithmetic number, because the mean of its divisors is an integer number (8555136).

Almost surely, 2^87021123 is an apocalyptic number.

87021123 is a deficient number, since it is larger than the sum of its proper divisors (49861053).

87021123 is a wasteful number, since it uses less digits than its factorization.

87021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133714.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 87021123 is about 9328.5112960215. The cubic root of 87021123 is about 443.1406201943.

The spelling of 87021123 in words is "eighty-seven million, twenty-one thousand, one hundred twenty-three".