20430352721 has 16 divisors (see below), whose sum is σ = 20831720448. Its totient is φ = 20033395200.

The previous prime is 20430352703. The next prime is 20430352739. The reversal of 20430352721 is 12725303402.

It is an interprime number because it is at equal distance from previous prime (20430352703) and next prime (20430352739).

It is a cyclic number.

It is not a de Polignac number, because 20430352721 - 2¹⁴ = 20430336337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20430352751) 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 15 ways as a sum of consecutive naturals, for example, 13888016 + ... + 13889486.

It is an arithmetic number, because the mean of its divisors is an integer number (1301982528).

Almost surely, 2^20430352721 is an apocalyptic number.

It is an amenable number.

20430352721 is a deficient number, since it is larger than the sum of its proper divisors (401367727).

20430352721 is a wasteful number, since it uses less digits than its factorization.

20430352721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2792.

The product of its (nonzero) digits is 10080, while the sum is 29.

The spelling of 20430352721 in words is "twenty billion, four hundred thirty million, three hundred fifty-two thousand, seven hundred twenty-one".