1012112020021 has 4 divisors (see below), whose sum is σ = 1019393401600. Its totient is φ = 1004830638444.

The previous prime is 1012112019979. The next prime is 1012112020063. The reversal of 1012112020021 is 1200202112101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1012112019979) and next prime (1012112020063).

It is a cyclic number.

It is not a de Polignac number, because 1012112020021 - 2⁹ = 1012112019509 is a prime.

It is a super-3 number, since 3×1012112020021³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012112019983 and 1012112020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012112020321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3640690581 + ... + 3640690858.

It is an arithmetic number, because the mean of its divisors is an integer number (254848350400).

Almost surely, 2^{1012112020021} is an apocalyptic number.

It is an amenable number.

1012112020021 is a deficient number, since it is larger than the sum of its proper divisors (7281381579).

1012112020021 is an equidigital number, since it uses as much as digits as its factorization.

1012112020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7281381578.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1012112020021 its reverse (1200202112101), we get a palindrome (2212314132122).

The spelling of 1012112020021 in words is "one trillion, twelve billion, one hundred twelve million, twenty thousand, twenty-one".