220211221012121 has 8 divisors (see below), whose sum is σ = 220262147905800. Its totient is φ = 220160295234432.

The previous prime is 220211221012103. The next prime is 220211221012241. The reversal of 220211221012121 is 121210122112022.

It can be written as a sum of positive squares in 4 ways, for example, as 80249544320521 + 139961676691600 = 8958211^2 + 11830540^2 .

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 220211221012121 - 2¹⁴ = 220211220995737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220211221012093 and 220211221012102.

It is not an unprimeable number, because it can be changed into a prime (220211221014121) 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, 495131981 + ... + 495576533.

It is an arithmetic number, because the mean of its divisors is an integer number (27532768488225).

Almost surely, 2^{220211221012121} is an apocalyptic number.

It is an amenable number.

220211221012121 is a deficient number, since it is larger than the sum of its proper divisors (50926893679).

220211221012121 is a wasteful number, since it uses less digits than its factorization.

220211221012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557995.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 220211221012121 its reverse (121210122112022), we get a palindrome (341421343124143).

The spelling of 220211221012121 in words is "two hundred twenty trillion, two hundred eleven billion, two hundred twenty-one million, twelve thousand, one hundred twenty-one".