21020212220211 has 6 divisors (see below), whose sum is σ = 30362528762540. Its totient is φ = 14013474813468.

The previous prime is 21020212220207. The next prime is 21020212220339. The reversal of 21020212220211 is 11202221202012.

It is a happy number.

21020212220211 is a `hidden beast` number, since 2 + 1 + 0 + 20 + 212 + 220 + 211 = 666.

It is not a de Polignac number, because 21020212220211 - 2² = 21020212220207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020212220201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167789567781 + ... + 1167789567798.

Almost surely, 2^{21020212220211} is an apocalyptic number.

21020212220211 is a deficient number, since it is larger than the sum of its proper divisors (9342316542329).

21020212220211 is a wasteful number, since it uses less digits than its factorization.

21020212220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2335579135585 (or 2335579135582 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21020212220211 its reverse (11202221202012), we get a palindrome (32222433422223).

The spelling of 21020212220211 in words is "twenty-one trillion, twenty billion, two hundred twelve million, two hundred twenty thousand, two hundred eleven".