21202012111212 has 36 divisors (see below), whose sum is σ = 53594640413496. Its totient is φ = 7067249631360.

The previous prime is 21202012111199. The next prime is 21202012111243. The reversal of 21202012111212 is 21211121020212.

21202012111212 is a `hidden beast` number, since 21 + 20 + 201 + 211 + 1 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21202012111212² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 682614 + ... + 6547517.

It is an arithmetic number, because the mean of its divisors is an integer number (1488740011486).

Almost surely, 2^{21202012111212} is an apocalyptic number.

It is an amenable number.

21202012111212 is an abundant number, since it is smaller than the sum of its proper divisors (32392628302284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21202012111212 is a wasteful number, since it uses less digits than its factorization.

21202012111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7311598 (or 7311593 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21202012111212 its reverse (21211121020212), we get a palindrome (42413133131424).

The spelling of 21202012111212 in words is "twenty-one trillion, two hundred two billion, twelve million, one hundred eleven thousand, two hundred twelve".