211212221210101 has 2 divisors, whose sum is σ = 211212221210102. Its totient is φ = 211212221210100.

The previous prime is 211212221210093. The next prime is 211212221210129. The reversal of 211212221210101 is 101012122212112.

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., 199467885356100 + 11744335854001 = 14123310^2 + 3427001^2 .

It is a cyclic number.

It is not a de Polignac number, because 211212221210101 - 2³ = 211212221210093 is a prime.

It is a super-2 number, since 2×211212221210101² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211212221210701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105606110605050 + 105606110605051.

It is an arithmetic number, because the mean of its divisors is an integer number (105606110605051).

Almost surely, 2^{211212221210101} is an apocalyptic number.

It is an amenable number.

211212221210101 is a deficient number, since it is larger than the sum of its proper divisors (1).

211212221210101 is an equidigital number, since it uses as much as digits as its factorization.

211212221210101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211212221210101 its reverse (101012122212112), we get a palindrome (312224343422213).

The spelling of 211212221210101 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred twenty-one million, two hundred ten thousand, one hundred one".