1012020001021 has 2 divisors, whose sum is σ = 1012020001022. Its totient is φ = 1012020001020.

The previous prime is 1012020000991. The next prime is 1012020001033. The reversal of 1012020001021 is 1201000202101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 985629998521 + 26390002500 = 992789^2 + 162450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012020001021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1012020000989 and 1012020001007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012020001061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506010000510 + 506010000511.

It is an arithmetic number, because the mean of its divisors is an integer number (506010000511).

Almost surely, 2^{1012020001021} is an apocalyptic number.

It is an amenable number.

1012020001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012020001021 is an equidigital number, since it uses as much as digits as its factorization.

1012020001021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1012020001021 its reverse (1201000202101), we get a palindrome (2213020203122).

The spelling of 1012020001021 in words is "one trillion, twelve billion, twenty million, one thousand, twenty-one".