2121011111001 has 4 divisors (see below), whose sum is σ = 2828014814672. Its totient is φ = 1414007407332.

The previous prime is 2121011110991. The next prime is 2121011111033. The reversal of 2121011111001 is 1001111101212.

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 not a de Polignac number, because 2121011111001 - 2²⁶ = 2120944002137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2121011111081) 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, 353501851831 + ... + 353501851836.

It is an arithmetic number, because the mean of its divisors is an integer number (707003703668).

Almost surely, 2^{2121011111001} is an apocalyptic number.

It is an amenable number.

2121011111001 is a deficient number, since it is larger than the sum of its proper divisors (707003703671).

2121011111001 is an equidigital number, since it uses as much as digits as its factorization.

2121011111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707003703670.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 2121011111001 its reverse (1001111101212), we get a palindrome (3122122212213).

The spelling of 2121011111001 in words is "two trillion, one hundred twenty-one billion, eleven million, one hundred eleven thousand, one".