1201001211221 has 16 divisors (see below), whose sum is σ = 1373633088384. Its totient is φ = 1028634669504.

The previous prime is 1201001211217. The next prime is 1201001211227. The reversal of 1201001211221 is 1221121001021.

It is a cyclic number.

It is not a de Polignac number, because 1201001211221 - 2² = 1201001211217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201001211196 and 1201001211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201001211227) 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, 91721951 + ... + 91735043.

It is an arithmetic number, because the mean of its divisors is an integer number (85852068024).

Almost surely, 2^{1201001211221} is an apocalyptic number.

It is an amenable number.

1201001211221 is a deficient number, since it is larger than the sum of its proper divisors (172631877163).

1201001211221 is a wasteful number, since it uses less digits than its factorization.

1201001211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22220.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1201001211221 its reverse (1221121001021), we get a palindrome (2422122212242).

The spelling of 1201001211221 in words is "one trillion, two hundred one billion, one million, two hundred eleven thousand, two hundred twenty-one".