1221202141 has 4 divisors (see below), whose sum is σ = 1221272800. Its totient is φ = 1221131484.

The previous prime is 1221202133. The next prime is 1221202159. The reversal of 1221202141 is 1412021221.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1221202141 - 2³ = 1221202133 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 (1221202841) 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 3 ways as a sum of consecutive naturals, for example, 9880 + ... + 50398.

It is an arithmetic number, because the mean of its divisors is an integer number (305318200).

Almost surely, 2^1221202141 is an apocalyptic number.

It is an amenable number.

1221202141 is a deficient number, since it is larger than the sum of its proper divisors (70659).

1221202141 is an equidigital number, since it uses as much as digits as its factorization.

1221202141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70658.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1221202141 is about 34945.7027544160. The cubic root of 1221202141 is about 1068.8805776140.

Adding to 1221202141 its reverse (1412021221), we get a palindrome (2633223362).

The spelling of 1221202141 in words is "one billion, two hundred twenty-one million, two hundred two thousand, one hundred forty-one".