21011031013331 has 8 divisors (see below), whose sum is σ = 22080731525424. Its totient is φ = 19967742859680.

The previous prime is 21011031013319. The next prime is 21011031013429. The reversal of 21011031013331 is 13331013011012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011031013331 is a prime.

It is a super-2 number, since 2×21011031013331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011031013031) 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, 6603087980 + ... + 6603091161.

It is an arithmetic number, because the mean of its divisors is an integer number (2760091440678).

Almost surely, 2^{21011031013331} is an apocalyptic number.

21011031013331 is a deficient number, since it is larger than the sum of its proper divisors (1069700512093).

21011031013331 is a wasteful number, since it uses less digits than its factorization.

21011031013331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13206179221.

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 21011031013331 its reverse (13331013011012), we get a palindrome (34342044024343).

The spelling of 21011031013331 in words is "twenty-one trillion, eleven billion, thirty-one million, thirteen thousand, three hundred thirty-one".