20310187621 has 2 divisors, whose sum is σ = 20310187622. Its totient is φ = 20310187620.

The previous prime is 20310187577. The next prime is 20310187627. The reversal of 20310187621 is 12678101302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12036284100 + 8273903521 = 109710^2 + 90961^2 .

It is a cyclic number.

It is not a de Polignac number, because 20310187621 - 2¹⁷ = 20310056549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20310187627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155093810 + 10155093811.

It is an arithmetic number, because the mean of its divisors is an integer number (10155093811).

Almost surely, 2^20310187621 is an apocalyptic number.

It is an amenable number.

20310187621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310187621 is an equidigital number, since it uses as much as digits as its factorization.

20310187621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

Adding to 20310187621 its reverse (12678101302), we get a palindrome (32988288923).

The spelling of 20310187621 in words is "twenty billion, three hundred ten million, one hundred eighty-seven thousand, six hundred twenty-one".