21011212030331 has 16 divisors (see below), whose sum is σ = 22255284014208. Its totient is φ = 19768043472000.

The previous prime is 21011212030313. The next prime is 21011212030363. The reversal of 21011212030331 is 13303021211012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21011212030331 - 2¹⁰ = 21011212029307 is a prime.

It is a super-2 number, since 2×21011212030331² (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 (21011212038331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 711482036 + ... + 711511566.

It is an arithmetic number, because the mean of its divisors is an integer number (1390955250888).

Almost surely, 2^{21011212030331} is an apocalyptic number.

21011212030331 is a deficient number, since it is larger than the sum of its proper divisors (1244071983877).

21011212030331 is a wasteful number, since it uses less digits than its factorization.

21011212030331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43402.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21011212030331 its reverse (13303021211012), we get a palindrome (34314233241343).

The spelling of 21011212030331 in words is "twenty-one trillion, eleven billion, two hundred twelve million, thirty thousand, three hundred thirty-one".