2102060721 has 8 divisors (see below), whose sum is σ = 2822911840. Its totient is φ = 1391291712.

The previous prime is 2102060717. The next prime is 2102060729. The reversal of 2102060721 is 1270602012.

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

It is not a de Polignac number, because 2102060721 - 2² = 2102060717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2102060729) 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, 2520040 + ... + 2520873.

It is an arithmetic number, because the mean of its divisors is an integer number (352863980).

Almost surely, 2^2102060721 is an apocalyptic number.

It is an amenable number.

2102060721 is a deficient number, since it is larger than the sum of its proper divisors (720851119).

2102060721 is a wasteful number, since it uses less digits than its factorization.

2102060721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5041055.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 2102060721 is about 45848.2357457732. The cubic root of 2102060721 is about 1280.9979036640.

Adding to 2102060721 its reverse (1270602012), we get a palindrome (3372662733).

The spelling of 2102060721 in words is "two billion, one hundred two million, sixty thousand, seven hundred twenty-one".