2109723421 has 8 divisors (see below), whose sum is σ = 2275021784. Its totient is φ = 1944855360.

The previous prime is 2109723397. The next prime is 2109723467. The reversal of 2109723421 is 1243279012.

It can be written as a sum of positive squares in 4 ways, for example, as 338155321 + 1771568100 = 18389^2 + 42090^2 .

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 2109723421 - 2¹⁷ = 2109592349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109723521) 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, 97350 + ... + 117031.

It is an arithmetic number, because the mean of its divisors is an integer number (284377723).

Almost surely, 2^2109723421 is an apocalyptic number.

It is an amenable number.

2109723421 is a deficient number, since it is larger than the sum of its proper divisors (165298363).

2109723421 is a wasteful number, since it uses less digits than its factorization.

2109723421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215151.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 2109723421 is about 45931.7256479658. The cubic root of 2109723421 is about 1282.5525684494.

The spelling of 2109723421 in words is "two billion, one hundred nine million, seven hundred twenty-three thousand, four hundred twenty-one".