1203213221 has 4 divisors (see below), whose sum is σ = 1375100832. Its totient is φ = 1031325612.

The previous prime is 1203213203. The next prime is 1203213223. The reversal of 1203213221 is 1223123021.

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 a cyclic number.

It is not a de Polignac number, because 1203213221 - 2¹⁴ = 1203196837 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1203213221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1203213223) 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, 85943795 + ... + 85943808.

It is an arithmetic number, because the mean of its divisors is an integer number (343775208).

Almost surely, 2^1203213221 is an apocalyptic number.

It is an amenable number.

1203213221 is a deficient number, since it is larger than the sum of its proper divisors (171887611).

1203213221 is an equidigital number, since it uses as much as digits as its factorization.

1203213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171887610.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1203213221 is about 34687.3639961298. The cubic root of 1203213221 is about 1063.6062118644.

Adding to 1203213221 its reverse (1223123021), we get a palindrome (2426336242).

The spelling of 1203213221 in words is "one billion, two hundred three million, two hundred thirteen thousand, two hundred twenty-one".