1212211010121 has 16 divisors (see below), whose sum is σ = 1732137005184. Its totient is φ = 752112117504.

The previous prime is 1212211010117. The next prime is 1212211010149. The reversal of 1212211010121 is 1210101122121.

It is a happy number.

It is not a de Polignac number, because 1212211010121 - 2² = 1212211010117 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212211010121.

It is not an unprimeable number, because it can be changed into a prime (1212211010161) 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, 237406576 + ... + 237411681.

It is an arithmetic number, because the mean of its divisors is an integer number (108258562824).

Almost surely, 2^{1212211010121} is an apocalyptic number.

It is an amenable number.

1212211010121 is a deficient number, since it is larger than the sum of its proper divisors (519925995063).

1212211010121 is a wasteful number, since it uses less digits than its factorization.

1212211010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474818320.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1212211010121 its reverse (1210101122121), we get a palindrome (2422312132242).

The spelling of 1212211010121 in words is "one trillion, two hundred twelve billion, two hundred eleven million, ten thousand, one hundred twenty-one".