21212002000001 has 4 divisors (see below), whose sum is σ = 21212556064512. Its totient is φ = 21211447935492.

The previous prime is 21212001999997. The next prime is 21212002000037. The reversal of 21212002000001 is 10000020021212.

It is a happy number.

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 21212002000001 - 2² = 21212001999997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212002000201) 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, 276974825 + ... + 277051398.

It is an arithmetic number, because the mean of its divisors is an integer number (5303139016128).

Almost surely, 2^{21212002000001} is an apocalyptic number.

It is an amenable number.

21212002000001 is a deficient number, since it is larger than the sum of its proper divisors (554064511).

21212002000001 is an equidigital number, since it uses as much as digits as its factorization.

21212002000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554064510.

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

Adding to 21212002000001 its reverse (10000020021212), we get a palindrome (31212022021213).

The spelling of 21212002000001 in words is "twenty-one trillion, two hundred twelve billion, two million, one", and thus it is an aban number.