21212020120211 has 8 divisors (see below), whose sum is σ = 22135122858240. Its totient is φ = 20288987465032.

The previous prime is 21212020120189. The next prime is 21212020120217. The reversal of 21212020120211 is 11202102021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21212020120211 - 2²² = 21212015925907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21212020120211.

It is not an unprimeable number, because it can be changed into a prime (21212020120217) 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, 16901735 + ... + 18113328.

It is an arithmetic number, because the mean of its divisors is an integer number (2766890357280).

Almost surely, 2^{21212020120211} is an apocalyptic number.

21212020120211 is a deficient number, since it is larger than the sum of its proper divisors (923102738029).

21212020120211 is a wasteful number, since it uses less digits than its factorization.

21212020120211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35041425.

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

Adding to 21212020120211 its reverse (11202102021212), we get a palindrome (32414122141423).

The spelling of 21212020120211 in words is "twenty-one trillion, two hundred twelve billion, twenty million, one hundred twenty thousand, two hundred eleven".