11220121222001 has 4 divisors (see below), whose sum is σ = 11221945341504. Its totient is φ = 11218297102500.

The previous prime is 11220121221943. The next prime is 11220121222003. The reversal of 11220121222001 is 10022212102211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11220121222001 - 2⁶ = 11220121221937 is a prime.

It is a super-2 number, since 2×11220121222001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11220121222003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 912050525 + ... + 912062826.

It is an arithmetic number, because the mean of its divisors is an integer number (2805486335376).

Almost surely, 2^{11220121222001} is an apocalyptic number.

It is an amenable number.

11220121222001 is a deficient number, since it is larger than the sum of its proper divisors (1824119503).

11220121222001 is an equidigital number, since it uses as much as digits as its factorization.

11220121222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824119502.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11220121222001 its reverse (10022212102211), we get a palindrome (21242333324212).

The spelling of 11220121222001 in words is "eleven trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, one".