21212202100001 has 16 divisors (see below), whose sum is σ = 23946623433216. Its totient is φ = 18615223200000.

The previous prime is 21212202099997. The next prime is 21212202100009. The reversal of 21212202100001 is 10000120221212.

It is a cyclic number.

It is not a de Polignac number, because 21212202100001 - 2² = 21212202099997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212202100009) 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, 77426690 + ... + 77700171.

It is an arithmetic number, because the mean of its divisors is an integer number (1496663964576).

Almost surely, 2^{21212202100001} is an apocalyptic number.

It is an amenable number.

21212202100001 is a deficient number, since it is larger than the sum of its proper divisors (2734421333215).

21212202100001 is a wasteful number, since it uses less digits than its factorization.

21212202100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155127304.

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

Adding to 21212202100001 its reverse (10000120221212), we get a palindrome (31212322321213).

The spelling of 21212202100001 in words is "twenty-one trillion, two hundred twelve billion, two hundred two million, one hundred thousand, one".