1202312221 has 16 divisors (see below), whose sum is σ = 1322155008. Its totient is φ = 1084262400.

The previous prime is 1202312219. The next prime is 1202312227. The reversal of 1202312221 is 1222132021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1202312221 - 2¹ = 1202312219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1202312195 and 1202312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202312227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1105540 + ... + 1106626.

It is an arithmetic number, because the mean of its divisors is an integer number (82634688).

Almost surely, 2^1202312221 is an apocalyptic number.

1202312221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1202312221 is a deficient number, since it is larger than the sum of its proper divisors (119842787).

1202312221 is a wasteful number, since it uses less digits than its factorization.

1202312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812.

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

The square root of 1202312221 is about 34674.3741255700. The cubic root of 1202312221 is about 1063.3406594578.

Adding to 1202312221 its reverse (1222132021), we get a palindrome (2424444242).

The spelling of 1202312221 in words is "one billion, two hundred two million, three hundred twelve thousand, two hundred twenty-one".