220212222121 has 4 divisors (see below), whose sum is σ = 220213826644. Its totient is φ = 220210617600.

The previous prime is 220212222067. The next prime is 220212222127. The reversal of 220212222121 is 121222212022.

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 82793732121 + 137418490000 = 287739^2 + 370700^2 .

It is a cyclic number.

It is not a de Polignac number, because 220212222121 - 2¹³ = 220212213929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220212222127) 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, 574920 + ... + 878041.

It is an arithmetic number, because the mean of its divisors is an integer number (55053456661).

Almost surely, 2^220212222121 is an apocalyptic number.

It is an amenable number.

220212222121 is a deficient number, since it is larger than the sum of its proper divisors (1604523).

220212222121 is a wasteful number, since it uses less digits than its factorization.

220212222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604522.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 220212222121 its reverse (121222212022), we get a palindrome (341434434143).

The spelling of 220212222121 in words is "two hundred twenty billion, two hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".