21000212002201 has 16 divisors (see below), whose sum is σ = 21642467140800. Its totient is φ = 20365074273600.

The previous prime is 21000212002141. The next prime is 21000212002207. The reversal of 21000212002201 is 10220021200012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21000212002201 - 2⁹ = 21000212001689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000212002207) 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, 13640251 + ... + 15101551.

It is an arithmetic number, because the mean of its divisors is an integer number (1352654196300).

Almost surely, 2^{21000212002201} is an apocalyptic number.

It is an amenable number.

21000212002201 is a deficient number, since it is larger than the sum of its proper divisors (642255138599).

21000212002201 is a wasteful number, since it uses less digits than its factorization.

21000212002201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463736.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21000212002201 its reverse (10220021200012), we get a palindrome (31220233202213).

The spelling of 21000212002201 in words is "twenty-one trillion, two hundred twelve million, two thousand, two hundred one".