21221020000201 has 16 divisors (see below), whose sum is σ = 25446872924928. Its totient is φ = 17302475361600.

The previous prime is 21221020000199. The next prime is 21221020000223. The reversal of 21221020000201 is 10200002012212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21221020000201 - 2¹ = 21221020000199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221020000001) 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, 364080190 + ... + 364138471.

It is an arithmetic number, because the mean of its divisors is an integer number (1590429557808).

Almost surely, 2^{21221020000201} is an apocalyptic number.

It is an amenable number.

21221020000201 is a deficient number, since it is larger than the sum of its proper divisors (4225852924727).

21221020000201 is a wasteful number, since it uses less digits than its factorization.

21221020000201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728218872.

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

Adding to 21221020000201 its reverse (10200002012212), we get a palindrome (31421022012413).

The spelling of 21221020000201 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred one", and thus it is an aban number.