21030112012309 has 8 divisors (see below), whose sum is σ = 21079328339160. Its totient is φ = 20980942944000.

The previous prime is 21030112012303. The next prime is 21030112012319. The reversal of 21030112012309 is 90321021103012.

It can be written as a sum of positive squares in 4 ways, for example, as 4320183035025 + 16709928977284 = 2078505^2 + 4087778^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21030112012309 - 2⁷ = 21030112012181 is a prime.

It is a super-2 number, since 2×21030112012309² (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 (21030112012303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10923514 + ... + 12703675.

It is an arithmetic number, because the mean of its divisors is an integer number (2634916042395).

Almost surely, 2^{21030112012309} is an apocalyptic number.

It is an amenable number.

21030112012309 is a deficient number, since it is larger than the sum of its proper divisors (49216326851).

21030112012309 is a wasteful number, since it uses less digits than its factorization.

21030112012309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23629271.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 21030112012309 in words is "twenty-one trillion, thirty billion, one hundred twelve million, twelve thousand, three hundred nine".