212102100001 has 4 divisors (see below), whose sum is σ = 231384109104. Its totient is φ = 192820090900.

The previous prime is 212102099983. The next prime is 212102100017. The reversal of 212102100001 is 100001201212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212102100001 - 2¹³ = 212102091809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212102100061) 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, 9641004535 + ... + 9641004556.

It is an arithmetic number, because the mean of its divisors is an integer number (57846027276).

Almost surely, 2^212102100001 is an apocalyptic number.

It is an amenable number.

212102100001 is a deficient number, since it is larger than the sum of its proper divisors (19282009103).

212102100001 is a wasteful number, since it uses less digits than its factorization.

212102100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19282009102.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 212102100001 its reverse (100001201212), we get a palindrome (312103301213).

The spelling of 212102100001 in words is "two hundred twelve billion, one hundred two million, one hundred thousand, one".