1213210101 has 4 divisors (see below), whose sum is σ = 1617613472. Its totient is φ = 808806732.

The previous prime is 1213210091. The next prime is 1213210109. The reversal of 1213210101 is 1010123121.

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 not a de Polignac number, because 1213210101 - 2⁷ = 1213209973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213210109) 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, 202201681 + ... + 202201686.

It is an arithmetic number, because the mean of its divisors is an integer number (404403368).

Almost surely, 2^1213210101 is an apocalyptic number.

It is an amenable number.

1213210101 is a deficient number, since it is larger than the sum of its proper divisors (404403371).

1213210101 is an equidigital number, since it uses as much as digits as its factorization.

1213210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404403370.

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

The square root of 1213210101 is about 34831.1656566357. The cubic root of 1213210101 is about 1066.5437437233.

Adding to 1213210101 its reverse (1010123121), we get a palindrome (2223333222).

The spelling of 1213210101 in words is "one billion, two hundred thirteen million, two hundred ten thousand, one hundred one".