21000201201 has 96 divisors (see below), whose sum is σ = 38068392960. Its totient is φ = 10877110272.

The previous prime is 21000201199. The next prime is 21000201217. The reversal of 21000201201 is 10210200012.

It is not a de Polignac number, because 21000201201 - 2¹ = 21000201199 is a prime.

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 (21000201281) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19038616 + ... + 19039718.

It is an arithmetic number, because the mean of its divisors is an integer number (396545760).

Almost surely, 2^21000201201 is an apocalyptic number.

21000201201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21000201201 is a deficient number, since it is larger than the sum of its proper divisors (17068191759).

21000201201 is a wasteful number, since it uses less digits than its factorization.

21000201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775 (or 1772 counting only the distinct ones).

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

Adding to 21000201201 its reverse (10210200012), we get a palindrome (31210401213).

The spelling of 21000201201 in words is "twenty-one billion, two hundred one thousand, two hundred one".