11220212222121 has 8 divisors (see below), whose sum is σ = 17097466243264. Its totient is φ = 6411549841200.

The previous prime is 11220212222117. The next prime is 11220212222159. The reversal of 11220212222121 is 12122221202211.

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

It is not a de Polignac number, because 11220212222121 - 2² = 11220212222117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 534295820101 = 11220212222121 / (1 + 1 + 2 + 2 + 0 + 2 + 1 + 2 + 2 + 2 + 2 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11220212222111) 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, 267147910030 + ... + 267147910071.

It is an arithmetic number, because the mean of its divisors is an integer number (2137183280408).

Almost surely, 2^{11220212222121} is an apocalyptic number.

It is an amenable number.

11220212222121 is a deficient number, since it is larger than the sum of its proper divisors (5877254021143).

11220212222121 is an equidigital number, since it uses as much as digits as its factorization.

11220212222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534295820111.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 11220212222121 its reverse (12122221202211), we get a palindrome (23342433424332).

The spelling of 11220212222121 in words is "eleven trillion, two hundred twenty billion, two hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".