2121503999 has 8 divisors (see below), whose sum is σ = 2152508160. Its totient is φ = 2090603736.

The previous prime is 2121503983. The next prime is 2121504023. The reversal of 2121503999 is 9993051212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121503999 - 2⁴ = 2121503983 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 (2121503929) 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, 15644 + ... + 66990.

It is an arithmetic number, because the mean of its divisors is an integer number (269063520).

Almost surely, 2^2121503999 is an apocalyptic number.

2121503999 is a deficient number, since it is larger than the sum of its proper divisors (31004161).

2121503999 is an equidigital number, since it uses as much as digits as its factorization.

2121503999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51949.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 2121503999 is about 46059.7872226957. The cubic root of 2121503999 is about 1284.9353728089.

The spelling of 2121503999 in words is "two billion, one hundred twenty-one million, five hundred three thousand, nine hundred ninety-nine".