2121011121211 has 16 divisors (see below), whose sum is σ = 2148438240000. Its totient is φ = 2093718492000.

The previous prime is 2121011121209. The next prime is 2121011121253. The reversal of 2121011121211 is 1121211101212.

It is a cyclic number.

It is not a de Polignac number, because 2121011121211 - 2¹ = 2121011121209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121011121311) 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, 51940960 + ... + 51981778.

It is an arithmetic number, because the mean of its divisors is an integer number (134277390000).

Almost surely, 2^{2121011121211} is an apocalyptic number.

2121011121211 is a deficient number, since it is larger than the sum of its proper divisors (27427118789).

2121011121211 is a wasteful number, since it uses less digits than its factorization.

2121011121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42450.

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

Adding to 2121011121211 its reverse (1121211101212), we get a palindrome (3242222222423).

The spelling of 2121011121211 in words is "two trillion, one hundred twenty-one billion, eleven million, one hundred twenty-one thousand, two hundred eleven".