2123001987 has 16 divisors (see below), whose sum is σ = 2875344000. Its totient is φ = 1393077312.

The previous prime is 2123001967. The next prime is 2123002001. The reversal of 2123001987 is 7891003212.

It is not a de Polignac number, because 2123001987 - 2¹⁹ = 2122477699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2123001967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99568 + ... + 118994.

It is an arithmetic number, because the mean of its divisors is an integer number (179709000).

Almost surely, 2^2123001987 is an apocalyptic number.

2123001987 is a deficient number, since it is larger than the sum of its proper divisors (752342013).

2123001987 is a wasteful number, since it uses less digits than its factorization.

2123001987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20002.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 2123001987 is about 46076.0456962183. The cubic root of 2123001987 is about 1285.2377314048.

The spelling of 2123001987 in words is "two billion, one hundred twenty-three million, one thousand, nine hundred eighty-seven".