102021999 has 8 divisors (see below), whose sum is σ = 136173312. Its totient is φ = 67942680.

The previous prime is 102021991. The next prime is 102022003. The reversal of 102021999 is 999120201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 102021999 - 2³ = 102021991 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14599 + ... + 20424.

It is an arithmetic number, because the mean of its divisors is an integer number (17021664).

Almost surely, 2^102021999 is an apocalyptic number.

102021999 is a deficient number, since it is larger than the sum of its proper divisors (34151313).

102021999 is an equidigital number, since it uses as much as digits as its factorization.

102021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35997.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 102021999 is about 10100.5939924343. The cubic root of 102021999 is about 467.2664607999.

The spelling of 102021999 in words is "one hundred two million, twenty-one thousand, nine hundred ninety-nine".