1211111010121 has 8 divisors (see below), whose sum is σ = 1235268166464. Its totient is φ = 1187151055440.

The previous prime is 1211111010103. The next prime is 1211111010127. The reversal of 1211111010121 is 1210101111121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211111010121 - 2¹⁵ = 1211110977353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211111010127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49288011 + ... + 49312576.

It is an arithmetic number, because the mean of its divisors is an integer number (154408520808).

Almost surely, 2^{1211111010121} is an apocalyptic number.

It is an amenable number.

1211111010121 is a deficient number, since it is larger than the sum of its proper divisors (24157156343).

1211111010121 is an equidigital number, since it uses as much as digits as its factorization.

1211111010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98600831.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1211111010121 its reverse (1210101111121), we get a palindrome (2421212121242).

The spelling of 1211111010121 in words is "one trillion, two hundred eleven billion, one hundred eleven million, ten thousand, one hundred twenty-one".