1040423021021 has 2 divisors, whose sum is σ = 1040423021022. Its totient is φ = 1040423021020.

The previous prime is 1040423021017. The next prime is 1040423021041. The reversal of 1040423021021 is 1201203240401.

It is an a-pointer prime, because the next prime (1040423021041) can be obtained adding 1040423021021 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 886139822500 + 154283198521 = 941350^2 + 392789^2 .

It is a cyclic number.

It is not a de Polignac number, because 1040423021021 - 2² = 1040423021017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1040423020984 and 1040423021002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1040423021041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520211510510 + 520211510511.

It is an arithmetic number, because the mean of its divisors is an integer number (520211510511).

Almost surely, 2^{1040423021021} is an apocalyptic number.

It is an amenable number.

1040423021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1040423021021 is an equidigital number, since it uses as much as digits as its factorization.

1040423021021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1040423021021 its reverse (1201203240401), we get a palindrome (2241626261422).

The spelling of 1040423021021 in words is "one trillion, forty billion, four hundred twenty-three million, twenty-one thousand, twenty-one".