21000121002201 has 16 divisors (see below), whose sum is σ = 30546421475328. Its totient is φ = 12727016509200.

The previous prime is 21000121002163. The next prime is 21000121002209. The reversal of 21000121002201 is 10220012100012.

It is not a de Polignac number, because 21000121002201 - 2⁷ = 21000121002073 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21000121002209) 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, 6942001 + ... + 9496926.

It is an arithmetic number, because the mean of its divisors is an integer number (1909151342208).

Almost surely, 2^{21000121002201} is an apocalyptic number.

It is an amenable number.

21000121002201 is a deficient number, since it is larger than the sum of its proper divisors (9546300473127).

21000121002201 is a wasteful number, since it uses less digits than its factorization.

21000121002201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16477652.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21000121002201 its reverse (10220012100012), we get a palindrome (31220133102213).

The spelling of 21000121002201 in words is "twenty-one trillion, one hundred twenty-one million, two thousand, two hundred one".