1201212112221 has 96 divisors (see below), whose sum is σ = 2030069164032. Its totient is φ = 676340513280.

The previous prime is 1201212112201. The next prime is 1201212112229. The reversal of 1201212112221 is 1222112121021.

1201212112221 is a `hidden beast` number, since 120 + 1 + 212 + 112 + 221 = 666.

It is not a de Polignac number, because 1201212112221 - 2⁹ = 1201212111709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201212112194 and 1201212112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201212112229) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 198774426 + ... + 198780468.

It is an arithmetic number, because the mean of its divisors is an integer number (21146553792).

Almost surely, 2^{1201212112221} is an apocalyptic number.

1201212112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201212112221 is a deficient number, since it is larger than the sum of its proper divisors (828857051811).

1201212112221 is a wasteful number, since it uses less digits than its factorization.

1201212112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7583 (or 7580 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1201212112221 its reverse (1222112121021), we get a palindrome (2423324233242).

The spelling of 1201212112221 in words is "one trillion, two hundred one billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty-one".