1001020023121 has 2 divisors, whose sum is σ = 1001020023122. Its totient is φ = 1001020023120.

The previous prime is 1001020023109. The next prime is 1001020023137. The reversal of 1001020023121 is 1213200201001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 984333842496 + 16686180625 = 992136^2 + 129175^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001020023121 - 2²¹ = 1001017925969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001020023151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500510011560 + 500510011561.

It is an arithmetic number, because the mean of its divisors is an integer number (500510011561).

Almost surely, 2^{1001020023121} is an apocalyptic number.

It is an amenable number.

1001020023121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001020023121 is an equidigital number, since it uses as much as digits as its factorization.

1001020023121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 1001020023121 its reverse (1213200201001), we get a palindrome (2214220224122).

The spelling of 1001020023121 in words is "one trillion, one billion, twenty million, twenty-three thousand, one hundred twenty-one".