21201000201 has 12 divisors (see below), whose sum is σ = 30904619460. Its totient is φ = 14004329760.

The previous prime is 21201000181. The next prime is 21201000211. The reversal of 21201000201 is 10200010212.

It can be written as a sum of positive squares in 2 ways, for example, as 15419678976 + 5781321225 = 124176^2 + 76035^2 .

It is not a de Polignac number, because 21201000201 - 2⁶ = 21201000137 is a prime.

It is a super-3 number, since 3×21201000201³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21201000211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10804830 + ... + 10806791.

It is an arithmetic number, because the mean of its divisors is an integer number (2575384955).

Almost surely, 2^21201000201 is an apocalyptic number.

It is an amenable number.

21201000201 is a deficient number, since it is larger than the sum of its proper divisors (9703619259).

21201000201 is a wasteful number, since it uses less digits than its factorization.

21201000201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21611736 (or 21611733 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21201000201 its reverse (10200010212), we get a palindrome (31401010413).

The spelling of 21201000201 in words is "twenty-one billion, two hundred one million, two hundred one", and thus it is an aban number.