211212210201121 has 8 divisors (see below), whose sum is σ = 212417880653160. Its totient is φ = 210009096845952.

The previous prime is 211212210201101. The next prime is 211212210201151. The reversal of 211212210201121 is 121102012212112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22009571742096 + 189202638459025 = 4691436^2 + 13755095^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211212210201121 - 2³¹ = 211210062717473 is a prime.

It is a super-2 number, since 2×211212210201121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211212210201101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639108550 + ... + 639438943.

It is an arithmetic number, because the mean of its divisors is an integer number (26552235081645).

Almost surely, 2^{211212210201121} is an apocalyptic number.

It is an amenable number.

211212210201121 is a deficient number, since it is larger than the sum of its proper divisors (1205670452039).

211212210201121 is a wasteful number, since it uses less digits than its factorization.

211212210201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278548435.

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

Adding to 211212210201121 its reverse (121102012212112), we get a palindrome (332314222413233).

The spelling of 211212210201121 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred ten million, two hundred one thousand, one hundred twenty-one".