212220000021121 has 8 divisors (see below), whose sum is σ = 214855654984488. Its totient is φ = 209594824800000.

The previous prime is 212220000021109. The next prime is 212220000021149. The reversal of 212220000021121 is 121120000022212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 152526822530625 + 59693177490496 = 12350175^2 + 7726136^2 .

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 212220000021121 - 2⁷ = 212220000020993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212220000021095 and 212220000021104.

It is not an unprimeable number, because it can be changed into a prime (212220000021151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2619894810 + ... + 2619975811.

It is an arithmetic number, because the mean of its divisors is an integer number (26856956873061).

Almost surely, 2^{212220000021121} is an apocalyptic number.

It is an amenable number.

212220000021121 is a deficient number, since it is larger than the sum of its proper divisors (2635654963367).

212220000021121 is a wasteful number, since it uses less digits than its factorization.

212220000021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5239871123.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212220000021121 its reverse (121120000022212), we get a palindrome (333340000043333).

The spelling of 212220000021121 in words is "two hundred twelve trillion, two hundred twenty billion, twenty-one thousand, one hundred twenty-one".