1012000020021 has 16 divisors (see below), whose sum is σ = 1501344518400. Its totient is φ = 673728326784.

The previous prime is 1012000019971. The next prime is 1012000020077. The reversal of 1012000020021 is 1200200002101.

It is not a de Polignac number, because 1012000020021 - 2³³ = 1003410085429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1012000019985 and 1012000020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012000020121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26045596 + ... + 26084421.

It is an arithmetic number, because the mean of its divisors is an integer number (93834032400).

Almost surely, 2^{1012000020021} is an apocalyptic number.

It is an amenable number.

1012000020021 is a deficient number, since it is larger than the sum of its proper divisors (489344498379).

1012000020021 is an equidigital number, since it uses as much as digits as its factorization.

1012000020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52130745 (or 52130739 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1012000020021 its reverse (1200200002101), we get a palindrome (2212200022122).

The spelling of 1012000020021 in words is "one trillion, twelve billion, twenty thousand, twenty-one".