1210202221 has 4 divisors (see below), whose sum is σ = 1211489244. Its totient is φ = 1208915200.

The previous prime is 1210202209. The next prime is 1210202237. The reversal of 1210202221 is 1222020121.

It is a happy number.

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 698809225 + 511392996 = 26435^2 + 22614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210202221 - 2¹⁵ = 1210169453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210202281) 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, 642100 + ... + 643981.

It is an arithmetic number, because the mean of its divisors is an integer number (302872311).

Almost surely, 2^1210202221 is an apocalyptic number.

It is an amenable number.

1210202221 is a deficient number, since it is larger than the sum of its proper divisors (1287023).

1210202221 is an equidigital number, since it uses as much as digits as its factorization.

1210202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287022.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1210202221 is about 34787.9608629192. The cubic root of 1210202221 is about 1065.6615963111.

Adding to 1210202221 its reverse (1222020121), we get a palindrome (2432222342).

The spelling of 1210202221 in words is "one billion, two hundred ten million, two hundred two thousand, two hundred twenty-one".