2012100100021 has 16 divisors (see below), whose sum is σ = 2335816137600. Its totient is φ = 1712931770880.

The previous prime is 2012100100019. The next prime is 2012100100027. The reversal of 2012100100021 is 1200010012102.

It is not a de Polignac number, because 2012100100021 - 2¹ = 2012100100019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2012100099980 and 2012100100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012100100027) 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, 26997696 + ... + 27072121.

It is an arithmetic number, because the mean of its divisors is an integer number (145988508600).

Almost surely, 2^{2012100100021} is an apocalyptic number.

It is an amenable number.

2012100100021 is a deficient number, since it is larger than the sum of its proper divisors (323716037579).

2012100100021 is a wasteful number, since it uses less digits than its factorization.

2012100100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54070044.

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

Adding to 2012100100021 its reverse (1200010012102), we get a palindrome (3212110112123).

The spelling of 2012100100021 in words is "two trillion, twelve billion, one hundred million, one hundred thousand, twenty-one".