2100012212221 has 32 divisors (see below), whose sum is σ = 2644760918016. Its totient is φ = 1619778600000.

The previous prime is 2100012212219. The next prime is 2100012212281. The reversal of 2100012212221 is 1222122100012.

It is a happy number.

It is not a de Polignac number, because 2100012212221 - 2¹ = 2100012212219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100012212195 and 2100012212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100012212281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34367146 + ... + 34428196.

It is an arithmetic number, because the mean of its divisors is an integer number (82648778688).

Almost surely, 2^{2100012212221} is an apocalyptic number.

It is an amenable number.

2100012212221 is a deficient number, since it is larger than the sum of its proper divisors (544748705795).

2100012212221 is a wasteful number, since it uses less digits than its factorization.

2100012212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65593.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2100012212221 its reverse (1222122100012), we get a palindrome (3322134312233).

It can be divided in two parts, 21000 and 12212221, that added together give a palindrome (12233221).

The spelling of 2100012212221 in words is "two trillion, one hundred billion, twelve million, two hundred twelve thousand, two hundred twenty-one".