21012130033331 has 4 divisors (see below), whose sum is σ = 21030073783464. Its totient is φ = 20994186283200.

The previous prime is 21012130033201. The next prime is 21012130033369. The reversal of 21012130033331 is 13333003121012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21012130033331 - 2¹⁸ = 21012129771187 is a prime.

It is a super-2 number, since 2×21012130033331² (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 = 21012130033297 and 21012130033306.

It is not an unprimeable number, because it can be changed into a prime (21012130033031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8971873310 + ... + 8971875651.

It is an arithmetic number, because the mean of its divisors is an integer number (5257518445866).

Almost surely, 2^{21012130033331} is an apocalyptic number.

21012130033331 is a deficient number, since it is larger than the sum of its proper divisors (17943750133).

21012130033331 is a wasteful number, since it uses less digits than its factorization.

21012130033331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17943750132.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 21012130033331 its reverse (13333003121012), we get a palindrome (34345133154343).

The spelling of 21012130033331 in words is "twenty-one trillion, twelve billion, one hundred thirty million, thirty-three thousand, three hundred thirty-one".