20001200202121 has 8 divisors (see below), whose sum is σ = 20558121731840. Its totient is φ = 19448450369712.

The previous prime is 20001200202073. The next prime is 20001200202131. The reversal of 20001200202121 is 12120200210002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001200202121 - 2⁷ = 20001200201993 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 1042914606 + ... + 1042933783.

It is an arithmetic number, because the mean of its divisors is an integer number (2569765216480).

Almost surely, 2^{20001200202121} is an apocalyptic number.

It is an amenable number.

20001200202121 is a deficient number, since it is larger than the sum of its proper divisors (556921529719).

20001200202121 is a wasteful number, since it uses less digits than its factorization.

20001200202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085848655.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20001200202121 its reverse (12120200210002), we get a palindrome (32121400412123).

The spelling of 20001200202121 in words is "twenty trillion, one billion, two hundred million, two hundred two thousand, one hundred twenty-one".