2101656401 has 8 divisors (see below), whose sum is σ = 2267023080. Its totient is φ = 1936818432.

The previous prime is 2101656283. The next prime is 2101656409. The reversal of 2101656401 is 1046561012.

It can be written as a sum of positive squares in 4 ways, for example, as 63043600 + 2038612801 = 7940^2 + 45151^2 .

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 2101656401 - 2¹⁸ = 2101394257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101656409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123896 + ... + 139833.

It is an arithmetic number, because the mean of its divisors is an integer number (283377885).

Almost surely, 2^2101656401 is an apocalyptic number.

It is an amenable number.

2101656401 is a deficient number, since it is larger than the sum of its proper divisors (165366679).

2101656401 is a wasteful number, since it uses less digits than its factorization.

2101656401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264355.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 2101656401 is about 45843.8262037540. The cubic root of 2101656401 is about 1280.9157673936.

The spelling of 2101656401 in words is "two billion, one hundred one million, six hundred fifty-six thousand, four hundred one".