102721287 has 16 divisors (see below), whose sum is σ = 140958720. Its totient is φ = 66490272.

The previous prime is 102721271. The next prime is 102721303. The reversal of 102721287 is 782127201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (102721271) and next prime (102721303).

It is not a de Polignac number, because 102721287 - 2⁴ = 102721271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102721237) 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, 92578 + ... + 93680.

It is an arithmetic number, because the mean of its divisors is an integer number (8809920).

Almost surely, 2^102721287 is an apocalyptic number.

102721287 is a deficient number, since it is larger than the sum of its proper divisors (38237433).

102721287 is a wasteful number, since it uses less digits than its factorization.

102721287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 102721287 is about 10135.1510595551. The cubic root of 102721287 is about 468.3316235660.

Adding to 102721287 its reverse (782127201), we get a palindrome (884848488).

The spelling of 102721287 in words is "one hundred two million, seven hundred twenty-one thousand, two hundred eighty-seven".