21220202111211 has 6 divisors (see below), whose sum is σ = 30651403049540. Its totient is φ = 14146801407468.

The previous prime is 21220202111197. The next prime is 21220202111291. The reversal of 21220202111211 is 11211120202212.

21220202111211 is a `hidden beast` number, since 2 + 1 + 220 + 20 + 211 + 1 + 211 = 666.

It is not a de Polignac number, because 21220202111211 - 2¹³ = 21220202103019 is a prime.

It is a super-2 number, since 2×21220202111211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220202111291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1178900117281 + ... + 1178900117298.

Almost surely, 2^{21220202111211} is an apocalyptic number.

21220202111211 is a deficient number, since it is larger than the sum of its proper divisors (9431200938329).

21220202111211 is a wasteful number, since it uses less digits than its factorization.

21220202111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357800234585 (or 2357800234582 counting only the distinct ones).

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

Adding to 21220202111211 its reverse (11211120202212), we get a palindrome (32431322313423).

The spelling of 21220202111211 in words is "twenty-one trillion, two hundred twenty billion, two hundred two million, one hundred eleven thousand, two hundred eleven".