20102020100021 has 8 divisors (see below), whose sum is σ = 20870417293824. Its totient is φ = 19341119464560.

The previous prime is 20102020099957. The next prime is 20102020100027. The reversal of 20102020100021 is 12000102020102.

It is a happy number.

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 20102020100021 - 2⁶ = 20102020099957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102020099975 and 20102020100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102020100027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1874134121 + ... + 1874144846.

It is an arithmetic number, because the mean of its divisors is an integer number (2608802161728).

Almost surely, 2^{20102020100021} is an apocalyptic number.

It is an amenable number.

20102020100021 is a deficient number, since it is larger than the sum of its proper divisors (768397193803).

20102020100021 is a wasteful number, since it uses less digits than its factorization.

20102020100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3748279171.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20102020100021 its reverse (12000102020102), we get a palindrome (32102122120123).

The spelling of 20102020100021 in words is "twenty trillion, one hundred two billion, twenty million, one hundred thousand, twenty-one".