21211000212212 has 24 divisors (see below), whose sum is σ = 39508509196800. Its totient is φ = 9929387219840.

The previous prime is 21211000212187. The next prime is 21211000212217. The reversal of 21211000212212 is 21221200011212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211000212217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 816548462 + ... + 816574437.

It is an arithmetic number, because the mean of its divisors is an integer number (1646187883200).

Almost surely, 2^{21211000212212} is an apocalyptic number.

It is an amenable number.

21211000212212 is a deficient number, since it is larger than the sum of its proper divisors (18297508984588).

21211000212212 is a wasteful number, since it uses less digits than its factorization.

21211000212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633123111 (or 1633123109 counting only the distinct ones).

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

Adding to 21211000212212 its reverse (21221200011212), we get a palindrome (42432200223424).

The spelling of 21211000212212 in words is "twenty-one trillion, two hundred eleven billion, two hundred twelve thousand, two hundred twelve".