212121110001 has 16 divisors (see below), whose sum is σ = 307558750464. Its totient is φ = 129498418944.

The previous prime is 212121109997. The next prime is 212121110083. The reversal of 212121110001 is 100011121212.

It is not a de Polignac number, because 212121110001 - 2² = 212121109997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212121110101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56204025 + ... + 56207798.

It is an arithmetic number, because the mean of its divisors is an integer number (19222421904).

Almost surely, 2^212121110001 is an apocalyptic number.

It is an amenable number.

212121110001 is a deficient number, since it is larger than the sum of its proper divisors (95437640463).

212121110001 is a wasteful number, since it uses less digits than its factorization.

212121110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112411880.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 212121110001 its reverse (100011121212), we get a palindrome (312132231213).

The spelling of 212121110001 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred ten thousand, one".