1210100221 has 8 divisors (see below), whose sum is σ = 1362693888. Its totient is φ = 1064604000.

The previous prime is 1210100209. The next prime is 1210100237. The reversal of 1210100221 is 1220010121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1210100221 - 2⁵ = 1210100189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210100198 and 1210100207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210100251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1774000 + ... + 1774681.

It is an arithmetic number, because the mean of its divisors is an integer number (170336736).

Almost surely, 2^1210100221 is an apocalyptic number.

1210100221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210100221 is a deficient number, since it is larger than the sum of its proper divisors (152593667).

1210100221 is a wasteful number, since it uses less digits than its factorization.

1210100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3548723.

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

The square root of 1210100221 is about 34786.4948076118. The cubic root of 1210100221 is about 1065.6316562634.

Adding to 1210100221 its reverse (1220010121), we get a palindrome (2430110342).

The spelling of 1210100221 in words is "one billion, two hundred ten million, one hundred thousand, two hundred twenty-one".