21012221183 has 2 divisors, whose sum is σ = 21012221184. Its totient is φ = 21012221182.

The previous prime is 21012221171. The next prime is 21012221207. The reversal of 21012221183 is 38112221012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012221183 - 2¹² = 21012217087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012220183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506110591 + 10506110592.

It is an arithmetic number, because the mean of its divisors is an integer number (10506110592).

Almost surely, 2^21012221183 is an apocalyptic number.

21012221183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012221183 is an equidigital number, since it uses as much as digits as its factorization.

21012221183 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 21012221183 its reverse (38112221012), we get a palindrome (59124442195).

The spelling of 21012221183 in words is "twenty-one billion, twelve million, two hundred twenty-one thousand, one hundred eighty-three".