2102019985 has 16 divisors (see below), whose sum is σ = 2728134864. Its totient is φ = 1545587712.

The previous prime is 2102019977. The next prime is 2102020003. The reversal of 2102019985 is 5899102012.

It can be written as a sum of positive squares in 8 ways, for example, as 315098001 + 1786921984 = 17751^2 + 42272^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102019985 - 2³ = 2102019977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54252 + ... + 84541.

It is an arithmetic number, because the mean of its divisors is an integer number (170508429).

Almost surely, 2^2102019985 is an apocalyptic number.

It is an amenable number.

2102019985 is a deficient number, since it is larger than the sum of its proper divisors (626114879).

2102019985 is a wasteful number, since it uses less digits than its factorization.

2102019985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139044.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 2102019985 is about 45847.7914953381. The cubic root of 2102019985 is about 1280.9896287575.

The spelling of 2102019985 in words is "two billion, one hundred two million, nineteen thousand, nine hundred eighty-five".