2012100211021 has 4 divisors (see below), whose sum is σ = 2045085460444. Its totient is φ = 1979114961600.

The previous prime is 2012100211019. The next prime is 2012100211039. The reversal of 2012100211021 is 1201120012102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 531424962121 + 1480675248900 = 728989^2 + 1216830^2 .

It is a cyclic number.

It is not a de Polignac number, because 2012100211021 - 2¹ = 2012100211019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012100210992 and 2012100211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012100211081) 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, 16492624620 + ... + 16492624741.

It is an arithmetic number, because the mean of its divisors is an integer number (511271365111).

Almost surely, 2^{2012100211021} is an apocalyptic number.

It is an amenable number.

2012100211021 is a deficient number, since it is larger than the sum of its proper divisors (32985249423).

2012100211021 is an equidigital number, since it uses as much as digits as its factorization.

2012100211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32985249422.

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

Adding to 2012100211021 its reverse (1201120012102), we get a palindrome (3213220223123).

The spelling of 2012100211021 in words is "two trillion, twelve billion, one hundred million, two hundred eleven thousand, twenty-one".