2123021321011 has 4 divisors (see below), whose sum is σ = 2196228952800. Its totient is φ = 2049813689224.

The previous prime is 2123021321009. The next prime is 2123021321017. The reversal of 2123021321011 is 1101231203212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2123021321011 - 2¹ = 2123021321009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2123021321011.

It is not an unprimeable number, because it can be changed into a prime (2123021321017) 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, 36603815851 + ... + 36603815908.

It is an arithmetic number, because the mean of its divisors is an integer number (549057238200).

Almost surely, 2^{2123021321011} is an apocalyptic number.

2123021321011 is a deficient number, since it is larger than the sum of its proper divisors (73207631789).

2123021321011 is an equidigital number, since it uses as much as digits as its factorization.

2123021321011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73207631788.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2123021321011 its reverse (1101231203212), we get a palindrome (3224252524223).

The spelling of 2123021321011 in words is "two trillion, one hundred twenty-three billion, twenty-one million, three hundred twenty-one thousand, eleven".