2101336721 has 8 divisors (see below), whose sum is σ = 2321385600. Its totient is φ = 1886124240.

The previous prime is 2101336709. The next prime is 2101336751. The reversal of 2101336721 is 1276331012.

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

It is a de Polignac number, because none of the positive numbers 2^k-2101336721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101336751) 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, 1208186 + ... + 1209923.

It is an arithmetic number, because the mean of its divisors is an integer number (290173200).

Almost surely, 2^2101336721 is an apocalyptic number.

It is an amenable number.

2101336721 is a deficient number, since it is larger than the sum of its proper divisors (220048879).

2101336721 is a wasteful number, since it uses less digits than its factorization.

2101336721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2418199.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 2101336721 is about 45840.3394511864. The cubic root of 2101336721 is about 1280.8508180016.

Adding to 2101336721 its reverse (1276331012), we get a palindrome (3377667733).

The spelling of 2101336721 in words is "two billion, one hundred one million, three hundred thirty-six thousand, seven hundred twenty-one".