20102102021 has 8 divisors (see below), whose sum is σ = 20290515840. Its totient is φ = 19914314112.

The previous prime is 20102101951. The next prime is 20102102039. The reversal of 20102102021 is 12020120102.

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 20102102021 - 2¹⁴ = 20102085637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102101993 and 20102102011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102102621) 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 7 ways as a sum of consecutive naturals, for example, 91820 + ... + 220533.

It is an arithmetic number, because the mean of its divisors is an integer number (2536314480).

Almost surely, 2^20102102021 is an apocalyptic number.

It is an amenable number.

20102102021 is a deficient number, since it is larger than the sum of its proper divisors (188413819).

20102102021 is a wasteful number, since it uses less digits than its factorization.

20102102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312955.

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

Adding to 20102102021 its reverse (12020120102), we get a palindrome (32122222123).

The spelling of 20102102021 in words is "twenty billion, one hundred two million, one hundred two thousand, twenty-one".