21020001101121 has 16 divisors (see below), whose sum is σ = 30693514177728. Its totient is φ = 12689824972800.

The previous prime is 21020001101111. The next prime is 21020001101159. The reversal of 21020001101121 is 12110110002012.

It is not a de Polignac number, because 21020001101121 - 2⁴³ = 12223908078913 is a prime.

It is a super-2 number, since 2×21020001101121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020001101097 and 21020001101106.

It is not an unprimeable number, because it can be changed into a prime (21020001101111) 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, 1239232240 + ... + 1239249201.

It is an arithmetic number, because the mean of its divisors is an integer number (1918344636108).

Almost surely, 2^{21020001101121} is an apocalyptic number.

It is an amenable number.

21020001101121 is a deficient number, since it is larger than the sum of its proper divisors (9673513076607).

21020001101121 is a wasteful number, since it uses less digits than its factorization.

21020001101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478481712.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21020001101121 its reverse (12110110002012), we get a palindrome (33130111103133).

The spelling of 21020001101121 in words is "twenty-one trillion, twenty billion, one million, one hundred one thousand, one hundred twenty-one".