1213103021 has 8 divisors (see below), whose sum is σ = 1319354904. Its totient is φ = 1108699200.

The previous prime is 1213103009. The next prime is 1213103027. The reversal of 1213103021 is 1203013121.

It can be written as a sum of positive squares in 4 ways, for example, as 70324996 + 1142778025 = 8386^2 + 33805^2 .

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 1213103021 - 2²² = 1208908717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213102987 and 1213103005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213103027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460646 + ... + 463271.

It is an arithmetic number, because the mean of its divisors is an integer number (164919363).

Almost surely, 2^1213103021 is an apocalyptic number.

It is an amenable number.

1213103021 is a deficient number, since it is larger than the sum of its proper divisors (106251883).

1213103021 is a wasteful number, since it uses less digits than its factorization.

1213103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924031.

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

The square root of 1213103021 is about 34829.6284935685. The cubic root of 1213103021 is about 1066.5123644747.

Adding to 1213103021 its reverse (1203013121), we get a palindrome (2416116142).

The spelling of 1213103021 in words is "one billion, two hundred thirteen million, one hundred three thousand, twenty-one".