212220100001 has 24 divisors (see below), whose sum is σ = 265903006824. Its totient is φ = 167882077440.

The previous prime is 212220099983. The next prime is 212220100087. The reversal of 212220100001 is 100001022212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24883485025 + 187336614976 = 157745^2 + 432824^2 .

It is not a de Polignac number, because 212220100001 - 2¹⁴ = 212220083617 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212220100901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4264181 + ... + 4313661.

It is an arithmetic number, because the mean of its divisors is an integer number (11079291951).

Almost surely, 2^212220100001 is an apocalyptic number.

It is an amenable number.

212220100001 is a deficient number, since it is larger than the sum of its proper divisors (53682906823).

212220100001 is a wasteful number, since it uses less digits than its factorization.

212220100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56241 (or 56234 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 212220100001 its reverse (100001022212), we get a palindrome (312221122213).

The spelling of 212220100001 in words is "two hundred twelve billion, two hundred twenty million, one hundred thousand, one".