20001001022121 has 12 divisors (see below), whose sum is σ = 31021960769232. Its totient is φ = 11429143441128.

The previous prime is 20001001022081. The next prime is 20001001022153. The reversal of 20001001022121 is 12122010010002.

It is not a de Polignac number, because 20001001022121 - 2¹⁸ = 20001000759977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001001022097 and 20001001022106.

It is not an unprimeable number, because it can be changed into a prime (20001001062121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68030615575 + ... + 68030615868.

It is an arithmetic number, because the mean of its divisors is an integer number (2585163397436).

Almost surely, 2^{20001001022121} is an apocalyptic number.

20001001022121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20001001022121 is a deficient number, since it is larger than the sum of its proper divisors (11020959747111).

20001001022121 is a wasteful number, since it uses less digits than its factorization.

20001001022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136061231460 (or 136061231453 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20001001022121 its reverse (12122010010002), we get a palindrome (32123011032123).

The spelling of 20001001022121 in words is "twenty trillion, one billion, one million, twenty-two thousand, one hundred twenty-one".