21303030312031 has 12 divisors (see below), whose sum is σ = 23863219024680. Its totient is φ = 18986255127840.

The previous prime is 21303030312029. The next prime is 21303030312043. The reversal of 21303030312031 is 13021303030312.

It is not a de Polignac number, because 21303030312031 - 2¹ = 21303030312029 is a prime.

It is a super-2 number, since 2×21303030312031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21303030311993 and 21303030312011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303030312001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2173330165 + ... + 2173339966.

It is an arithmetic number, because the mean of its divisors is an integer number (1988601585390).

Almost surely, 2^{21303030312031} is an apocalyptic number.

21303030312031 is a deficient number, since it is larger than the sum of its proper divisors (2560188712649).

21303030312031 is a wasteful number, since it uses less digits than its factorization.

21303030312031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4346670186 (or 4346670173 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21303030312031 its reverse (13021303030312), we get a palindrome (34324333342343).

The spelling of 21303030312031 in words is "twenty-one trillion, three hundred three billion, thirty million, three hundred twelve thousand, thirty-one".