21836728303831 has 16 divisors (see below), whose sum is σ = 25438898050560. Its totient is φ = 18358681744800.

The previous prime is 21836728303823. The next prime is 21836728303837. The reversal of 21836728303831 is 13830382763812.

It is a cyclic number.

It is not a de Polignac number, because 21836728303831 - 2³ = 21836728303823 is a prime.

It is a super-2 number, since 2×21836728303831² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21836728303837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144253611 + ... + 144404908.

It is an arithmetic number, because the mean of its divisors is an integer number (1589931128160).

Almost surely, 2^{21836728303831} is an apocalyptic number.

21836728303831 is a deficient number, since it is larger than the sum of its proper divisors (3602169746729).

21836728303831 is a wasteful number, since it uses less digits than its factorization.

21836728303831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288658734.

The product of its (nonzero) digits is 6967296, while the sum is 55.

The spelling of 21836728303831 in words is "twenty-one trillion, eight hundred thirty-six billion, seven hundred twenty-eight million, three hundred three thousand, eight hundred thirty-one".