21121021202211 has 24 divisors (see below), whose sum is σ = 34866770887520. Its totient is φ = 12069043099776.

The previous prime is 21121021202209. The next prime is 21121021202221. The reversal of 21121021202211 is 11220212012112.

21121021202211 is a `hidden beast` number, since 21 + 1 + 210 + 21 + 202 + 211 = 666.

It is not a de Polignac number, because 21121021202211 - 2¹ = 21121021202209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121021202221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5552685 + ... + 8548353.

Almost surely, 2^{21121021202211} is an apocalyptic number.

21121021202211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21121021202211 is a deficient number, since it is larger than the sum of its proper divisors (13745749685309).

21121021202211 is a wasteful number, since it uses less digits than its factorization.

21121021202211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3107595 (or 3107592 counting only the distinct ones).

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

Adding to 21121021202211 its reverse (11220212012112), we get a palindrome (32341233214323).

The spelling of 21121021202211 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, two hundred two thousand, two hundred eleven".