20001011101021 has 16 divisors (see below), whose sum is σ = 20616565787136. Its totient is φ = 19392818454576.

The previous prime is 20001011100997. The next prime is 20001011101069. The reversal of 20001011101021 is 12010111010002.

It is a cyclic number.

It is not a de Polignac number, because 20001011101021 - 2²³ = 20001002712413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001011100989 and 20001011101007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001011101121) 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, 75726 + ... + 6325168.

It is an arithmetic number, because the mean of its divisors is an integer number (1288535361696).

Almost surely, 2^{20001011101021} is an apocalyptic number.

It is an amenable number.

20001011101021 is a deficient number, since it is larger than the sum of its proper divisors (615554686115).

20001011101021 is a wasteful number, since it uses less digits than its factorization.

20001011101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6250032.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20001011101021 its reverse (12010111010002), we get a palindrome (32011122111023).

The spelling of 20001011101021 in words is "twenty trillion, one billion, eleven million, one hundred one thousand, twenty-one".