21011122122812 has 48 divisors (see below), whose sum is σ = 37229953834080. Its totient is φ = 10374659942400.

The previous prime is 21011122122811. The next prime is 21011122122817. The reversal of 21011122122812 is 21822122111012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011122122811) 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, 183015764 + ... + 183130532.

It is an arithmetic number, because the mean of its divisors is an integer number (775624038210).

Almost surely, 2^{21011122122812} is an apocalyptic number.

It is an amenable number.

21011122122812 is a deficient number, since it is larger than the sum of its proper divisors (16218831711268).

21011122122812 is a wasteful number, since it uses less digits than its factorization.

21011122122812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116222 (or 116220 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 26.

Adding to 21011122122812 its reverse (21822122111012), we get a palindrome (42833244233824).

The spelling of 21011122122812 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, one hundred twenty-two thousand, eight hundred twelve".