2100220985 has 8 divisors (see below), whose sum is σ = 2544734400. Its totient is φ = 1663863984.

The previous prime is 2100220981. The next prime is 2100220999. The reversal of 2100220985 is 5890220012.

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 2100220985 - 2² = 2100220981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2100220981) 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, 2038535 + ... + 2039564.

It is an arithmetic number, because the mean of its divisors is an integer number (318091800).

Almost surely, 2^2100220985 is an apocalyptic number.

It is an amenable number.

2100220985 is a deficient number, since it is larger than the sum of its proper divisors (444513415).

2100220985 is a wasteful number, since it uses less digits than its factorization.

2100220985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4078207.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 2100220985 is about 45828.1680301537. The cubic root of 2100220985 is about 1280.6240822670.

Adding to 2100220985 its reverse (5890220012), we get a palindrome (7990440997).

The spelling of 2100220985 in words is "two billion, one hundred million, two hundred twenty thousand, nine hundred eighty-five".