1221100201211 has 8 divisors (see below), whose sum is σ = 1348158821184. Its totient is φ = 1096716499720.

The previous prime is 1221100201207. The next prime is 1221100201229. The reversal of 1221100201211 is 1121020011221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221100201211 - 2² = 1221100201207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221100201411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 668728661 + ... + 668730486.

It is an arithmetic number, because the mean of its divisors is an integer number (168519852648).

Almost surely, 2^{1221100201211} is an apocalyptic number.

1221100201211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221100201211 is a deficient number, since it is larger than the sum of its proper divisors (127058619973).

1221100201211 is a wasteful number, since it uses less digits than its factorization.

1221100201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337459241.

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

Adding to 1221100201211 its reverse (1121020011221), we get a palindrome (2342120212432).

The spelling of 1221100201211 in words is "one trillion, two hundred twenty-one billion, one hundred million, two hundred one thousand, two hundred eleven".