20110301621 has 2 divisors, whose sum is σ = 20110301622. Its totient is φ = 20110301620.

The previous prime is 20110301611. The next prime is 20110301639. The reversal of 20110301621 is 12610301102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19687176721 + 423124900 = 140311^2 + 20570^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110301621 - 2³⁴ = 2930432437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20110301621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110301611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055150810 + 10055150811.

It is an arithmetic number, because the mean of its divisors is an integer number (10055150811).

Almost surely, 2^20110301621 is an apocalyptic number.

It is an amenable number.

20110301621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110301621 is an equidigital number, since it uses as much as digits as its factorization.

20110301621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20110301621 its reverse (12610301102), we get a palindrome (32720602723).

The spelling of 20110301621 in words is "twenty billion, one hundred ten million, three hundred one thousand, six hundred twenty-one".