1220121201111 has 8 divisors (see below), whose sum is σ = 1628683263984. Its totient is φ = 812486636160.

The previous prime is 1220121201109. The next prime is 1220121201119. The reversal of 1220121201111 is 1111021210221.

It is a happy number.

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

It is not a de Polignac number, because 1220121201111 - 2¹ = 1220121201109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220121201119) 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, 231871410 + ... + 231876671.

It is an arithmetic number, because the mean of its divisors is an integer number (203585407998).

Almost surely, 2^{1220121201111} is an apocalyptic number.

1220121201111 is a deficient number, since it is larger than the sum of its proper divisors (408562062873).

1220121201111 is an equidigital number, since it uses as much as digits as its factorization.

1220121201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463748961.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1220121201111 its reverse (1111021210221), we get a palindrome (2331142411332).

The spelling of 1220121201111 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred one thousand, one hundred eleven".