21021000200001 has 16 divisors (see below), whose sum is σ = 32781286862400. Its totient is φ = 13276421178624.

The previous prime is 21021000199957. The next prime is 21021000200023. The reversal of 21021000200001 is 10000200012012.

It is not a de Polignac number, because 21021000200001 - 2⁶ = 21021000199937 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 (21021000200701) 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, 20488303776 + ... + 20488304801.

It is an arithmetic number, because the mean of its divisors is an integer number (2048830428900).

Almost surely, 2^{21021000200001} is an apocalyptic number.

It is an amenable number.

21021000200001 is a deficient number, since it is larger than the sum of its proper divisors (11760286662399).

21021000200001 is a wasteful number, since it uses less digits than its factorization.

21021000200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40976608605 (or 40976608599 counting only the distinct ones).

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

Adding to 21021000200001 its reverse (10000200012012), we get a palindrome (31021200212013).

The spelling of 21021000200001 in words is "twenty-one trillion, twenty-one billion, two hundred thousand, one".