1012120020021 has 16 divisors (see below), whose sum is σ = 1472292845568. Its totient is φ = 613356793200.

The previous prime is 1012120020011. The next prime is 1012120020029. The reversal of 1012120020021 is 1200200212101.

It is not a de Polignac number, because 1012120020021 - 2¹¹ = 1012120017973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1012120019979 and 1012120020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012120020029) 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, 812871 + ... + 1638596.

It is an arithmetic number, because the mean of its divisors is an integer number (92018302848).

Almost surely, 2^{1012120020021} is an apocalyptic number.

1012120020021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1012120020021 is a deficient number, since it is larger than the sum of its proper divisors (460172825547).

1012120020021 is a wasteful number, since it uses less digits than its factorization.

1012120020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463992.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1012120020021 its reverse (1200200212101), we get a palindrome (2212320232122).

The spelling of 1012120020021 in words is "one trillion, twelve billion, one hundred twenty million, twenty thousand, twenty-one".