1234400011021 has 2 divisors, whose sum is σ = 1234400011022. Its totient is φ = 1234400011020.

The previous prime is 1234400011003. The next prime is 1234400011073. The reversal of 1234400011021 is 1201100044321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 896070492100 + 338329518921 = 946610^2 + 581661^2 .

It is a cyclic number.

It is not a de Polignac number, because 1234400011021 - 2³³ = 1225810076429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1234400011021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1234400017021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617200005510 + 617200005511.

It is an arithmetic number, because the mean of its divisors is an integer number (617200005511).

Almost surely, 2^{1234400011021} is an apocalyptic number.

It is an amenable number.

1234400011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1234400011021 is an equidigital number, since it uses as much as digits as its factorization.

1234400011021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1234400011021 its reverse (1201100044321), we get a palindrome (2435500055342).

The spelling of 1234400011021 in words is "one trillion, two hundred thirty-four billion, four hundred million, eleven thousand, twenty-one".