2101110001221 has 32 divisors (see below), whose sum is σ = 3551953536000. Its totient is φ = 1072985950080.

The previous prime is 2101110001213. The next prime is 2101110001223. The reversal of 2101110001221 is 1221000111012.

It is not a de Polignac number, because 2101110001221 - 2³ = 2101110001213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101110001197 and 2101110001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101110001223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77068696 + ... + 77095953.

It is an arithmetic number, because the mean of its divisors is an integer number (110998548000).

Almost surely, 2^{2101110001221} is an apocalyptic number.

2101110001221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2101110001221 is a deficient number, since it is larger than the sum of its proper divisors (1450843534779).

2101110001221 is a wasteful number, since it uses less digits than its factorization.

2101110001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154164729.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2101110001221 its reverse (1221000111012), we get a palindrome (3322110112233).

The spelling of 2101110001221 in words is "two trillion, one hundred one billion, one hundred ten million, one thousand, two hundred twenty-one".