20011011202121 has 4 divisors (see below), whose sum is σ = 20656527692544. Its totient is φ = 19365494711700.

The previous prime is 20011011202111. The next prime is 20011011202139. The reversal of 20011011202121 is 12120211011002.

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 20011011202121 - 2⁶ = 20011011202057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011011202096 and 20011011202105.

It is not an unprimeable number, because it can be changed into a prime (20011011202111) 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, 322758245165 + ... + 322758245226.

It is an arithmetic number, because the mean of its divisors is an integer number (5164131923136).

Almost surely, 2^{20011011202121} is an apocalyptic number.

It is an amenable number.

20011011202121 is a deficient number, since it is larger than the sum of its proper divisors (645516490423).

20011011202121 is an equidigital number, since it uses as much as digits as its factorization.

20011011202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645516490422.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20011011202121 its reverse (12120211011002), we get a palindrome (32131222213123).

The spelling of 20011011202121 in words is "twenty trillion, eleven billion, eleven million, two hundred two thousand, one hundred twenty-one".