1210203421 has 6 divisors (see below), whose sum is σ = 1407787710. Its totient is φ = 1037317176.

The previous prime is 1210203403. The next prime is 1210203433. The reversal of 1210203421 is 1243020121.

It can be written as a sum of positive squares in only one way, i.e., 1190940100 + 19263321 = 34510^2 + 4389^2 .

It is not a de Polignac number, because 1210203421 - 2¹⁷ = 1210072349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210203395 and 1210203404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210203521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12348966 + ... + 12349063.

It is an arithmetic number, because the mean of its divisors is an integer number (234631285).

Almost surely, 2^1210203421 is an apocalyptic number.

It is an amenable number.

1210203421 is a deficient number, since it is larger than the sum of its proper divisors (197584289).

1210203421 is an equidigital number, since it uses as much as digits as its factorization.

1210203421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24698043 (or 24698036 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1210203421 is about 34787.9781102610. The cubic root of 1210203421 is about 1065.6619485370.

Adding to 1210203421 its reverse (1243020121), we get a palindrome (2453223542).

The spelling of 1210203421 in words is "one billion, two hundred ten million, two hundred three thousand, four hundred twenty-one".