1212202210121 has 16 divisors (see below), whose sum is σ = 1389319857024. Its totient is φ = 1036071972864.

The previous prime is 1212202210117. The next prime is 1212202210129. The reversal of 1212202210121 is 1210122022121.

It is a cyclic number.

It is not a de Polignac number, because 1212202210121 - 2² = 1212202210117 is a prime.

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 1212202210121.

It is not an unprimeable number, because it can be changed into a prime (1212202210129) 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, 17058761 + ... + 17129673.

It is an arithmetic number, because the mean of its divisors is an integer number (86832491064).

Almost surely, 2^{1212202210121} is an apocalyptic number.

It is an amenable number.

1212202210121 is a deficient number, since it is larger than the sum of its proper divisors (177117646903).

1212202210121 is an equidigital number, since it uses as much as digits as its factorization.

1212202210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77840.

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

Adding to 1212202210121 its reverse (1210122022121), we get a palindrome (2422324232242).

The spelling of 1212202210121 in words is "one trillion, two hundred twelve billion, two hundred two million, two hundred ten thousand, one hundred twenty-one".