1201011222221 has 64 divisors (see below), whose sum is σ = 1401662668800. Its totient is φ = 1022788166400.

The previous prime is 1201011222211. The next prime is 1201011222251. The reversal of 1201011222221 is 1222221101021.

It is a cyclic number.

It is not a de Polignac number, because 1201011222221 - 2¹⁸ = 1201010960077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201011222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201011222211) 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, 65273795 + ... + 65292191.

It is an arithmetic number, because the mean of its divisors is an integer number (21900979200).

Almost surely, 2^{1201011222221} is an apocalyptic number.

It is an amenable number.

1201011222221 is a deficient number, since it is larger than the sum of its proper divisors (200651446579).

1201011222221 is a wasteful number, since it uses less digits than its factorization.

1201011222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18610.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1201011222221 its reverse (1222221101021), we get a palindrome (2423232323242).

The spelling of 1201011222221 in words is "one trillion, two hundred one billion, eleven million, two hundred twenty-two thousand, two hundred twenty-one".