21121021022211 has 24 divisors (see below), whose sum is σ = 34355209175040. Its totient is φ = 12387695612400.

The previous prime is 21121021022207. The next prime is 21121021022221. The reversal of 21121021022211 is 11222012012112.

21121021022211 is a `hidden beast` number, since 2 + 11 + 210 + 210 + 22 + 211 = 666.

It is not a de Polignac number, because 21121021022211 - 2² = 21121021022207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21121021022221) 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, 3441023491 + ... + 3441029628.

It is an arithmetic number, because the mean of its divisors is an integer number (1431467048960).

Almost surely, 2^{21121021022211} is an apocalyptic number.

21121021022211 is a deficient number, since it is larger than the sum of its proper divisors (13234188152829).

21121021022211 is a wasteful number, since it uses less digits than its factorization.

21121021022211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6882053167 (or 6882053164 counting only the distinct ones).

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

Adding to 21121021022211 its reverse (11222012012112), we get a palindrome (32343033034323).

It can be divided in two parts, 2112102 and 1022211, that added together give a palindrome (3134313).

The spelling of 21121021022211 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, twenty-two thousand, two hundred eleven".