1213030121 has 4 divisors (see below), whose sum is σ = 1284384852. Its totient is φ = 1141675392.

The previous prime is 1213030111. The next prime is 1213030127. The reversal of 1213030121 is 1210303121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 894907225 + 318122896 = 29915^2 + 17836^2 .

It is not a de Polignac number, because 1213030121 - 2⁶ = 1213030057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213030096 and 1213030105.

It is not an unprimeable number, because it can be changed into a prime (1213030127) 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, 35677340 + ... + 35677373.

It is an arithmetic number, because the mean of its divisors is an integer number (321096213).

Almost surely, 2^1213030121 is an apocalyptic number.

It is an amenable number.

1213030121 is a deficient number, since it is larger than the sum of its proper divisors (71354731).

1213030121 is an equidigital number, since it uses as much as digits as its factorization.

1213030121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71354730.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1213030121 is about 34828.5819550552. The cubic root of 1213030121 is about 1066.4910004445.

Adding to 1213030121 its reverse (1210303121), we get a palindrome (2423333242).

The spelling of 1213030121 in words is "one billion, two hundred thirteen million, thirty thousand, one hundred twenty-one".