21000201212209 has 16 divisors (see below), whose sum is σ = 22114167264000. Its totient is φ = 19887106072320.

The previous prime is 21000201212197. The next prime is 21000201212213. The reversal of 21000201212209 is 90221210200012.

It is not a de Polignac number, because 21000201212209 - 2²¹ = 21000199115057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21000201212209.

It is not an unprimeable number, because it can be changed into a prime (21000211212209) 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, 595243032 + ... + 595278310.

It is an arithmetic number, because the mean of its divisors is an integer number (1382135454000).

Almost surely, 2^{21000201212209} is an apocalyptic number.

It is an amenable number.

21000201212209 is a deficient number, since it is larger than the sum of its proper divisors (1113966051791).

21000201212209 is a wasteful number, since it uses less digits than its factorization.

21000201212209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46728.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21000201212209 in words is "twenty-one trillion, two hundred one million, two hundred twelve thousand, two hundred nine".