20011201010021 has 64 divisors (see below), whose sum is σ = 22897408665600. Its totient is φ = 17349326032896.

The previous prime is 20011201009997. The next prime is 20011201010023. The reversal of 20011201010021 is 12001010211002.

It is not a de Polignac number, because 20011201010021 - 2⁶ = 20011201009957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011201009984 and 20011201010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011201010023) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6907558445 + ... + 6907561341.

It is an arithmetic number, because the mean of its divisors is an integer number (357772010400).

Almost surely, 2^{20011201010021} is an apocalyptic number.

It is an amenable number.

20011201010021 is a deficient number, since it is larger than the sum of its proper divisors (2886207655579).

20011201010021 is a wasteful number, since it uses less digits than its factorization.

20011201010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4518.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20011201010021 its reverse (12001010211002), we get a palindrome (32012211221023).

The spelling of 20011201010021 in words is "twenty trillion, eleven billion, two hundred one million, ten thousand, twenty-one".