20001200202101 has 4 divisors (see below), whose sum is σ = 21053894949600. Its totient is φ = 18948505454604.

The previous prime is 20001200202073. The next prime is 20001200202131. The reversal of 20001200202101 is 10120200210002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20001200202101 - 2²⁶ = 20001133093237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001200202131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526347373721 + ... + 526347373758.

It is an arithmetic number, because the mean of its divisors is an integer number (5263473737400).

Almost surely, 2^{20001200202101} is an apocalyptic number.

It is an amenable number.

20001200202101 is a deficient number, since it is larger than the sum of its proper divisors (1052694747499).

20001200202101 is a wasteful number, since it uses less digits than its factorization.

20001200202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052694747498.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20001200202101 its reverse (10120200210002), we get a palindrome (30121400412103).

The spelling of 20001200202101 in words is "twenty trillion, one billion, two hundred million, two hundred two thousand, one hundred one".