20011010121 has 48 divisors (see below), whose sum is σ = 31376721600. Its totient is φ = 12602858688.

The previous prime is 20011010087. The next prime is 20011010161. The reversal of 20011010121 is 12101011002.

It is a happy number.

It is not a de Polignac number, because 20011010121 - 2¹⁵ = 20010977353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20011010161) 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 47 ways as a sum of consecutive naturals, for example, 3691405 + ... + 3696821.

It is an arithmetic number, because the mean of its divisors is an integer number (653681700).

Almost surely, 2^20011010121 is an apocalyptic number.

It is an amenable number.

20011010121 is a deficient number, since it is larger than the sum of its proper divisors (11365711479).

20011010121 is a wasteful number, since it uses less digits than its factorization.

20011010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5843 (or 5818 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20011010121 its reverse (12101011002), we get a palindrome (32112021123).

The spelling of 20011010121 in words is "twenty billion, eleven million, ten thousand, one hundred twenty-one".