102102100999 has 4 divisors (see below), whose sum is σ = 102102748000. Its totient is φ = 102101454000.

The previous prime is 102102100993. The next prime is 102102101041. The reversal of 102102100999 is 999001201201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 999001201201 = 38431 ⋅25994671.

It is a cyclic number.

It is not a de Polignac number, because 102102100999 - 2¹¹ = 102102098951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102102100993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86002 + ... + 460000.

It is an arithmetic number, because the mean of its divisors is an integer number (25525687000).

Almost surely, 2^102102100999 is an apocalyptic number.

102102100999 is a deficient number, since it is larger than the sum of its proper divisors (647001).

102102100999 is an equidigital number, since it uses as much as digits as its factorization.

102102100999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647000.

The product of its (nonzero) digits is 2916, while the sum is 34.

It can be divided in two parts, 10210 and 2100999, that added together give a square (2111209 = 1453²).

The spelling of 102102100999 in words is "one hundred two billion, one hundred two million, one hundred thousand, nine hundred ninety-nine".