21000030002031 has 16 divisors (see below), whose sum is σ = 30755192682240. Its totient is φ = 12686516979840.

The previous prime is 21000030002027. The next prime is 21000030002033. The reversal of 21000030002031 is 13020003000012.

It is a happy number.

It is not a de Polignac number, because 21000030002031 - 2² = 21000030002027 is a prime.

It is a super-3 number, since 3×21000030002031³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21000030001998 and 21000030002016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000030002033) 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, 8009163450 + ... + 8009166071.

It is an arithmetic number, because the mean of its divisors is an integer number (1922199542640).

Almost surely, 2^{21000030002031} is an apocalyptic number.

21000030002031 is a deficient number, since it is larger than the sum of its proper divisors (9755162680209).

21000030002031 is a wasteful number, since it uses less digits than its factorization.

21000030002031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16018329566.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21000030002031 its reverse (13020003000012), we get a palindrome (34020033002043).

The spelling of 21000030002031 in words is "twenty-one trillion, thirty million, two thousand, thirty-one".