211213121201 has 4 divisors (see below), whose sum is σ = 211236363504. Its totient is φ = 211189878900.

The previous prime is 211213121179. The next prime is 211213121239. The reversal of 211213121201 is 102121312112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211213121201 is a prime.

It is a super-2 number, since 2×211213121201² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211213121201.

It is not an unprimeable number, because it can be changed into a prime (211213121281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11607515 + ... + 11625696.

It is an arithmetic number, because the mean of its divisors is an integer number (52809090876).

Almost surely, 2^211213121201 is an apocalyptic number.

It is an amenable number.

211213121201 is a deficient number, since it is larger than the sum of its proper divisors (23242303).

211213121201 is an equidigital number, since it uses as much as digits as its factorization.

211213121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23242302.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 211213121201 its reverse (102121312112), we get a palindrome (313334433313).

The spelling of 211213121201 in words is "two hundred eleven billion, two hundred thirteen million, one hundred twenty-one thousand, two hundred one".