21020112201212 has 12 divisors (see below), whose sum is σ = 36839054623896. Its totient is φ = 10494668022960.

The previous prime is 21020112201149. The next prime is 21020112201233. The reversal of 21020112201212 is 21210221102012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3847016339 + ... + 3847021802.

It is an arithmetic number, because the mean of its divisors is an integer number (3069921218658).

Almost surely, 2^{21020112201212} is an apocalyptic number.

It is an amenable number.

21020112201212 is a deficient number, since it is larger than the sum of its proper divisors (15818942422684).

21020112201212 is a wasteful number, since it uses less digits than its factorization.

21020112201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7694038828 (or 7694038826 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21020112201212 its reverse (21210221102012), we get a palindrome (42230333303224).

The spelling of 21020112201212 in words is "twenty-one trillion, twenty billion, one hundred twelve million, two hundred one thousand, two hundred twelve".