212122121201 has 16 divisors (see below), whose sum is σ = 220283900928. Its totient is φ = 204043924800.

The previous prime is 212122121171. The next prime is 212122121207. The reversal of 212122121201 is 102121221212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212122121201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212122121201.

It is not an unprimeable number, because it can be changed into a prime (212122121207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12857780 + ... + 12874266.

It is an arithmetic number, because the mean of its divisors is an integer number (13767743808).

Almost surely, 2^212122121201 is an apocalyptic number.

It is an amenable number.

212122121201 is a deficient number, since it is larger than the sum of its proper divisors (8161779727).

212122121201 is a wasteful number, since it uses less digits than its factorization.

212122121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18992.

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

Adding to 212122121201 its reverse (102121221212), we get a palindrome (314243342413).

The spelling of 212122121201 in words is "two hundred twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred one".