1221440200241 has 8 divisors (see below), whose sum is σ = 1226032680264. Its totient is φ = 1216852116480.

The previous prime is 1221440200237. The next prime is 1221440200247. The reversal of 1221440200241 is 1420020441221.

It can be written as a sum of positive squares in 4 ways, for example, as 46121857600 + 1175318342641 = 214760^2 + 1084121^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221440200241 - 2² = 1221440200237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221440200247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541820 + ... + 1654221.

It is an arithmetic number, because the mean of its divisors is an integer number (153254085033).

Almost surely, 2^{1221440200241} is an apocalyptic number.

It is an amenable number.

1221440200241 is a deficient number, since it is larger than the sum of its proper divisors (4592480023).

1221440200241 is a wasteful number, since it uses less digits than its factorization.

1221440200241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198131.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 1221440200241 its reverse (1420020441221), we get a palindrome (2641460641462).

The spelling of 1221440200241 in words is "one trillion, two hundred twenty-one billion, four hundred forty million, two hundred thousand, two hundred forty-one".