21211020102212 has 12 divisors (see below), whose sum is σ = 39302772542460. Its totient is φ = 9981656518656.

The previous prime is 21211020102211. The next prime is 21211020102313. The reversal of 21211020102212 is 21220102011212.

It can be written as a sum of positive squares in 2 ways, for example, as 10851595518976 + 10359424583236 = 3294176^2 + 3218606^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (21211020102211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155963383037 + ... + 155963383172.

It is an arithmetic number, because the mean of its divisors is an integer number (3275231045205).

Almost surely, 2^{21211020102212} is an apocalyptic number.

It is an amenable number.

21211020102212 is a deficient number, since it is larger than the sum of its proper divisors (18091752440248).

21211020102212 is a wasteful number, since it uses less digits than its factorization.

21211020102212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311926766230 (or 311926766228 counting only the distinct ones).

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

Adding to 21211020102212 its reverse (21220102011212), we get a palindrome (42431122113424).

The spelling of 21211020102212 in words is "twenty-one trillion, two hundred eleven billion, twenty million, one hundred two thousand, two hundred twelve".