21202212001 has 2 divisors, whose sum is σ = 21202212002. Its totient is φ = 21202212000.

The previous prime is 21202211999. The next prime is 21202212007. The reversal of 21202212001 is 10021220212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20570443776 + 631768225 = 143424^2 + 25135^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202212001 - 2¹ = 21202211999 is a prime.

It is a super-3 number, since 3×21202212001³ (a number of 32 digits) contains 333 as substring.

Together with 21202211999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21202212007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601106000 + 10601106001.

It is an arithmetic number, because the mean of its divisors is an integer number (10601106001).

Almost surely, 2^21202212001 is an apocalyptic number.

It is an amenable number.

21202212001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202212001 is an equidigital number, since it uses as much as digits as its factorization.

21202212001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21202212001 its reverse (10021220212), we get a palindrome (31223432213).

The spelling of 21202212001 in words is "twenty-one billion, two hundred two million, two hundred twelve thousand, one".