1211212112201 has 16 divisors (see below), whose sum is σ = 1490874271488. Its totient is φ = 958224168000.

The previous prime is 1211212112197. The next prime is 1211212112203. The reversal of 1211212112201 is 1022112121121.

It is a cyclic number.

It is not a de Polignac number, because 1211212112201 - 2² = 1211212112197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211212112201.

It is not an unprimeable number, because it can be changed into a prime (1211212112203) 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, 228836 + ... + 1573146.

It is an arithmetic number, because the mean of its divisors is an integer number (93179641968).

Almost surely, 2^{1211212112201} is an apocalyptic number.

It is an amenable number.

1211212112201 is a deficient number, since it is larger than the sum of its proper divisors (279662159287).

1211212112201 is a wasteful number, since it uses less digits than its factorization.

1211212112201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354232.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1211212112201 its reverse (1022112121121), we get a palindrome (2233324233322).

It can be divided in two parts, 121121 and 2112201, that added together give a palindrome (2233322).

The spelling of 1211212112201 in words is "one trillion, two hundred eleven billion, two hundred twelve million, one hundred twelve thousand, two hundred one".