21021212200201 has 4 divisors (see below), whose sum is σ = 21021240506112. Its totient is φ = 21021183894292.

The previous prime is 21021212200187. The next prime is 21021212200231. The reversal of 21021212200201 is 10200221212012.

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 21021212200201 - 2⁵ = 21021212200169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021212200231) 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, 13008121 + ... + 14534566.

It is an arithmetic number, because the mean of its divisors is an integer number (5255310126528).

Almost surely, 2^{21021212200201} is an apocalyptic number.

It is an amenable number.

21021212200201 is a deficient number, since it is larger than the sum of its proper divisors (28305911).

21021212200201 is an equidigital number, since it uses as much as digits as its factorization.

21021212200201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28305910.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21021212200201 its reverse (10200221212012), we get a palindrome (31221433412213).

The spelling of 21021212200201 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, two hundred thousand, two hundred one".