21223212212051 has 2 divisors, whose sum is σ = 21223212212052. Its totient is φ = 21223212212050.

The previous prime is 21223212212011. The next prime is 21223212212093. The reversal of 21223212212051 is 15021221232212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21223212212051 - 2¹⁰ = 21223212211027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21223212212051.

It is not a weakly prime, because it can be changed into another prime (21223212212011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611606106025 + 10611606106026.

It is an arithmetic number, because the mean of its divisors is an integer number (10611606106026).

Almost surely, 2^{21223212212051} is an apocalyptic number.

21223212212051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223212212051 is an equidigital number, since it uses as much as digits as its factorization.

21223212212051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 21223212212051 its reverse (15021221232212), we get a palindrome (36244433444263).

The spelling of 21223212212051 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred twelve million, two hundred twelve thousand, fifty-one".