20110102021 has 8 divisors (see below), whose sum is σ = 20336993784. Its totient is φ = 19883755200.

The previous prime is 20110101989. The next prime is 20110102031. The reversal of 20110102021 is 12020101102.

It can be written as a sum of positive squares in 4 ways, for example, as 19312660900 + 797441121 = 138970^2 + 28239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20110102021 - 2⁵ = 20110101989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20110101989 and 20110102007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110102031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61786 + ... + 209851.

It is an arithmetic number, because the mean of its divisors is an integer number (2542124223).

Almost surely, 2^20110102021 is an apocalyptic number.

It is an amenable number.

20110102021 is a deficient number, since it is larger than the sum of its proper divisors (226891763).

20110102021 is a wasteful number, since it uses less digits than its factorization.

20110102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272471.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20110102021 its reverse (12020101102), we get a palindrome (32130203123).

The spelling of 20110102021 in words is "twenty billion, one hundred ten million, one hundred two thousand, twenty-one".