21221112022001 has 2 divisors, whose sum is σ = 21221112022002. Its totient is φ = 21221112022000.

The previous prime is 21221112021997. The next prime is 21221112022027. The reversal of 21221112022001 is 10022021112212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20322785286400 + 898326735601 = 4508080^2 + 947801^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221112022001 - 2² = 21221112021997 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221112022601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610556011000 + 10610556011001.

It is an arithmetic number, because the mean of its divisors is an integer number (10610556011001).

Almost surely, 2^{21221112022001} is an apocalyptic number.

It is an amenable number.

21221112022001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221112022001 is an equidigital number, since it uses as much as digits as its factorization.

21221112022001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221112022001 its reverse (10022021112212), we get a palindrome (31243133134213).

The spelling of 21221112022001 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, twenty-two thousand, one".