102121210987 has 4 divisors (see below), whose sum is σ = 103075614936. Its totient is φ = 101166807040.

The previous prime is 102121210979. The next prime is 102121211033. The reversal of 102121210987 is 789012121201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 102121210987 - 2³ = 102121210979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102121217987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477201814 + ... + 477202027.

It is an arithmetic number, because the mean of its divisors is an integer number (25768903734).

Almost surely, 2^102121210987 is an apocalyptic number.

102121210987 is a deficient number, since it is larger than the sum of its proper divisors (954403949).

102121210987 is an equidigital number, since it uses as much as digits as its factorization.

102121210987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954403948.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 102121210987 in words is "one hundred two billion, one hundred twenty-one million, two hundred ten thousand, nine hundred eighty-seven".