1201111213221 has 24 divisors (see below), whose sum is σ = 1749968351040. Its totient is φ = 793819745856.

The previous prime is 1201111213171. The next prime is 1201111213231. The reversal of 1201111213221 is 1223121111021.

It is a happy number.

1201111213221 is a `hidden beast` number, since 120 + 1 + 111 + 213 + 221 = 666.

It is not a de Polignac number, because 1201111213221 - 2¹¹ = 1201111211173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201111213194 and 1201111213203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201111213231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 252096 + ... + 1570278.

It is an arithmetic number, because the mean of its divisors is an integer number (72915347960).

Almost surely, 2^{1201111213221} is an apocalyptic number.

It is an amenable number.

1201111213221 is a deficient number, since it is larger than the sum of its proper divisors (548857137819).

1201111213221 is a wasteful number, since it uses less digits than its factorization.

1201111213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319065 (or 1319062 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1201111213221 its reverse (1223121111021), we get a palindrome (2424232324242).

The spelling of 1201111213221 in words is "one trillion, two hundred one billion, one hundred eleven million, two hundred thirteen thousand, two hundred twenty-one".