21012132331 has 8 divisors (see below), whose sum is σ = 21411306720. Its totient is φ = 20613058752.

The previous prime is 21012132329. The next prime is 21012132359. The reversal of 21012132331 is 13323121012.

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 21012132331 - 2¹ = 21012132329 is a prime.

It is a super-2 number, since 2×21012132331² (a number of 21 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 = 21012132299 and 21012132308.

It is not an unprimeable number, because it can be changed into a prime (21012132371) 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, 497466 + ... + 538048.

It is an arithmetic number, because the mean of its divisors is an integer number (2676413340).

Almost surely, 2^21012132331 is an apocalyptic number.

21012132331 is a deficient number, since it is larger than the sum of its proper divisors (399174389).

21012132331 is an equidigital number, since it uses as much as digits as its factorization.

21012132331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50405.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21012132331 its reverse (13323121012), we get a palindrome (34335253343).

The spelling of 21012132331 in words is "twenty-one billion, twelve million, one hundred thirty-two thousand, three hundred thirty-one".