1211011210121 has 4 divisors (see below), whose sum is σ = 1211615810832. Its totient is φ = 1210406609412.

The previous prime is 1211011210117. The next prime is 1211011210141. The reversal of 1211011210121 is 1210121101121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211011210121 - 2² = 1211011210117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211011210096 and 1211011210105.

It is not an unprimeable number, because it can be changed into a prime (1211011210141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302297351 + ... + 302301356.

It is an arithmetic number, because the mean of its divisors is an integer number (302903952708).

Almost surely, 2^{1211011210121} is an apocalyptic number.

It is an amenable number.

1211011210121 is a deficient number, since it is larger than the sum of its proper divisors (604600711).

1211011210121 is an equidigital number, since it uses as much as digits as its factorization.

1211011210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604600710.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211011210121 its reverse (1210121101121), we get a palindrome (2421132311242).

The spelling of 1211011210121 in words is "one trillion, two hundred eleven billion, eleven million, two hundred ten thousand, one hundred twenty-one".