1221011200201 has 64 divisors (see below), whose sum is σ = 1525595258880. Its totient is φ = 965403774720.

The previous prime is 1221011200187. The next prime is 1221011200231. The reversal of 1221011200201 is 1020021101221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221011200201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221011200231) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7492155 + ... + 7653391.

It is an arithmetic number, because the mean of its divisors is an integer number (23837425920).

Almost surely, 2^{1221011200201} is an apocalyptic number.

It is an amenable number.

1221011200201 is a deficient number, since it is larger than the sum of its proper divisors (304584058679).

1221011200201 is a wasteful number, since it uses less digits than its factorization.

1221011200201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161366.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221011200201 its reverse (1020021101221), we get a palindrome (2241032301422).

The spelling of 1221011200201 in words is "one trillion, two hundred twenty-one billion, eleven million, two hundred thousand, two hundred one".