20310100021 has 8 divisors (see below), whose sum is σ = 21253881600. Its totient is φ = 19371379632.

The previous prime is 20310100003. The next prime is 20310100043. The reversal of 20310100021 is 12000101302.

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 20310100021 - 2⁷ = 20310099893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20310099980 and 20310100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310100621) 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, 1257085 + ... + 1273138.

It is an arithmetic number, because the mean of its divisors is an integer number (2656735200).

Almost surely, 2^20310100021 is an apocalyptic number.

It is an amenable number.

20310100021 is a deficient number, since it is larger than the sum of its proper divisors (943781579).

20310100021 is a wasteful number, since it uses less digits than its factorization.

20310100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530595.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 20310100021 its reverse (12000101302), we get a palindrome (32310201323).

The spelling of 20310100021 in words is "twenty billion, three hundred ten million, one hundred thousand, twenty-one".