2012100220021 has 4 divisors (see below), whose sum is σ = 2012117330944. Its totient is φ = 2012083109100.

The previous prime is 2012100219991. The next prime is 2012100220069. The reversal of 2012100220021 is 1200220012102.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 2012100220021 - 2¹³ = 2012100211829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012100219983 and 2012100220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012100224021) 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, 8377845 + ... + 8614666.

It is an arithmetic number, because the mean of its divisors is an integer number (503029332736).

Almost surely, 2^{2012100220021} is an apocalyptic number.

It is an amenable number.

2012100220021 is a deficient number, since it is larger than the sum of its proper divisors (17110923).

2012100220021 is a wasteful number, since it uses less digits than its factorization.

2012100220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17110922.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2012100220021 its reverse (1200220012102), we get a palindrome (3212320232123).

The spelling of 2012100220021 in words is "two trillion, twelve billion, one hundred million, two hundred twenty thousand, twenty-one".