20302010021 has 2 divisors, whose sum is σ = 20302010022. Its totient is φ = 20302010020.

The previous prime is 20302010009. The next prime is 20302010023. The reversal of 20302010021 is 12001020302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14079009025 + 6223000996 = 118655^2 + 78886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20302010021 - 2¹⁸ = 20301747877 is a prime.

It is a super-2 number, since 2×20302010021² (a number of 21 digits) contains 22 as substring.

Together with 20302010023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20302009984 and 20302010011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20302010023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10151005010 + 10151005011.

It is an arithmetic number, because the mean of its divisors is an integer number (10151005011).

Almost surely, 2^20302010021 is an apocalyptic number.

It is an amenable number.

20302010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20302010021 is an equidigital number, since it uses as much as digits as its factorization.

20302010021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20302010021 its reverse (12001020302), we get a palindrome (32303030323).

The spelling of 20302010021 in words is "twenty billion, three hundred two million, ten thousand, twenty-one".