212220100121 has 8 divisors (see below), whose sum is σ = 213405543624. Its totient is φ = 211034799360.

The previous prime is 212220100109. The next prime is 212220100153. The reversal of 212220100121 is 121001022212.

It can be written as a sum of positive squares in 4 ways, for example, as 100902025 + 212119198096 = 10045^2 + 460564^2 .

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 212220100121 - 2¹⁴ = 212220083737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212220100096 and 212220100105.

It is not an unprimeable number, because it can be changed into a prime (212220100621) 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, 4660355 + ... + 4705671.

It is an arithmetic number, because the mean of its divisors is an integer number (26675692953).

Almost surely, 2^212220100121 is an apocalyptic number.

It is an amenable number.

212220100121 is a deficient number, since it is larger than the sum of its proper divisors (1185443503).

212220100121 is a wasteful number, since it uses less digits than its factorization.

212220100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71371.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212220100121 its reverse (121001022212), we get a palindrome (333221122333).

The spelling of 212220100121 in words is "two hundred twelve billion, two hundred twenty million, one hundred thousand, one hundred twenty-one".