220201211221001 has 4 divisors (see below), whose sum is σ = 220739600490900. Its totient is φ = 219662821951104.

The previous prime is 220201211220983. The next prime is 220201211221021. The reversal of 220201211221001 is 100122112102022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146031635766025 + 74169575454976 = 12084355^2 + 8612176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220201211221001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220201211221021) 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, 269194634336 + ... + 269194635153.

It is an arithmetic number, because the mean of its divisors is an integer number (55184900122725).

Almost surely, 2^{220201211221001} is an apocalyptic number.

It is an amenable number.

220201211221001 is a deficient number, since it is larger than the sum of its proper divisors (538389269899).

220201211221001 is an equidigital number, since it uses as much as digits as its factorization.

220201211221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538389269898.

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

Adding to 220201211221001 its reverse (100122112102022), we get a palindrome (320323323323023).

The spelling of 220201211221001 in words is "two hundred twenty trillion, two hundred one billion, two hundred eleven million, two hundred twenty-one thousand, one".