1210100220221 has 4 divisors (see below), whose sum is σ = 1211542533600. Its totient is φ = 1208657906844.

The previous prime is 1210100220179. The next prime is 1210100220289. The reversal of 1210100220221 is 1220220010121.

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 1210100220221 - 2¹⁸ = 1210099958077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210100220196 and 1210100220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210100220421) 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, 721155431 + ... + 721157108.

It is an arithmetic number, because the mean of its divisors is an integer number (302885633400).

Almost surely, 2^{1210100220221} is an apocalyptic number.

It is an amenable number.

1210100220221 is a deficient number, since it is larger than the sum of its proper divisors (1442313379).

1210100220221 is an equidigital number, since it uses as much as digits as its factorization.

1210100220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442313378.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1210100220221 its reverse (1220220010121), we get a palindrome (2430320230342).

The spelling of 1210100220221 in words is "one trillion, two hundred ten billion, one hundred million, two hundred twenty thousand, two hundred twenty-one".