102101999 has 4 divisors (see below), whose sum is σ = 102285864. Its totient is φ = 101918136.

The previous prime is 102101971. The next prime is 102102019. The reversal of 102101999 is 999101201.

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 102101999 - 2⁸ = 102101743 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 (102101939) 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, 91097 + ... + 92210.

It is an arithmetic number, because the mean of its divisors is an integer number (25571466).

Almost surely, 2^102101999 is an apocalyptic number.

102101999 is a deficient number, since it is larger than the sum of its proper divisors (183865).

102101999 is an equidigital number, since it uses as much as digits as its factorization.

102101999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183864.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 102101999 is about 10104.5533795413. The cubic root of 102101999 is about 467.3885637146.

The spelling of 102101999 in words is "one hundred two million, one hundred one thousand, nine hundred ninety-nine".