20211012010121 has 4 divisors (see below), whose sum is σ = 20211039231252. Its totient is φ = 20210984788992.

The previous prime is 20211012010109. The next prime is 20211012010127. The reversal of 20211012010121 is 12101021011202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3603846624400 + 16607165385721 = 1898380^2 + 4075189^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211012010121 - 2¹⁴ = 20211011993737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211012010096 and 20211012010105.

It is not an unprimeable number, because it can be changed into a prime (20211012010127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12464696 + ... + 13992521.

It is an arithmetic number, because the mean of its divisors is an integer number (5052759807813).

Almost surely, 2^{20211012010121} is an apocalyptic number.

It is an amenable number.

20211012010121 is a deficient number, since it is larger than the sum of its proper divisors (27221131).

20211012010121 is an equidigital number, since it uses as much as digits as its factorization.

20211012010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27221130.

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

Adding to 20211012010121 its reverse (12101021011202), we get a palindrome (32312033021323).

The spelling of 20211012010121 in words is "twenty trillion, two hundred eleven billion, twelve million, ten thousand, one hundred twenty-one".