21000001200101 has 16 divisors (see below), whose sum is σ = 26451735354240. Its totient is φ = 16194940001280.

The previous prime is 21000001200089. The next prime is 21000001200127. The reversal of 21000001200101 is 10100210000012.

It is a cyclic number.

It is not a de Polignac number, because 21000001200101 - 2¹⁴ = 21000001183717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000001203101) 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, 1405803296 + ... + 1405818233.

It is an arithmetic number, because the mean of its divisors is an integer number (1653233459640).

Almost surely, 2^{21000001200101} is an apocalyptic number.

It is an amenable number.

21000001200101 is a deficient number, since it is larger than the sum of its proper divisors (5451734154139).

21000001200101 is a wasteful number, since it uses less digits than its factorization.

21000001200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2811621644.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21000001200101 its reverse (10100210000012), we get a palindrome (31100211200113).

The spelling of 21000001200101 in words is "twenty-one trillion, one million, two hundred thousand, one hundred one".