21012202122211 has 4 divisors (see below), whose sum is σ = 21198150813672. Its totient is φ = 20826253430752.

The previous prime is 21012202122203. The next prime is 21012202122217. The reversal of 21012202122211 is 11222120221012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21012202122211 - 2³ = 21012202122203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012202122217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92974345561 + ... + 92974345786.

It is an arithmetic number, because the mean of its divisors is an integer number (5299537703418).

Almost surely, 2^{21012202122211} is an apocalyptic number.

21012202122211 is a deficient number, since it is larger than the sum of its proper divisors (185948691461).

21012202122211 is a wasteful number, since it uses less digits than its factorization.

21012202122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185948691460.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21012202122211 its reverse (11222120221012), we get a palindrome (32234322343223).

The spelling of 21012202122211 in words is "twenty-one trillion, twelve billion, two hundred two million, one hundred twenty-two thousand, two hundred eleven".