20413201021 has 2 divisors, whose sum is σ = 20413201022. Its totient is φ = 20413201020.

The previous prime is 20413200937. The next prime is 20413201049. The reversal of 20413201021 is 12010231402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20388698521 + 24502500 = 142789^2 + 4950^2 .

It is a cyclic number.

It is not a de Polignac number, because 20413201021 - 2¹⁷ = 20413069949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20413200986 and 20413201004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20413201091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206600510 + 10206600511.

It is an arithmetic number, because the mean of its divisors is an integer number (10206600511).

Almost surely, 2^20413201021 is an apocalyptic number.

It is an amenable number.

20413201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20413201021 is an equidigital number, since it uses as much as digits as its factorization.

20413201021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20413201021 its reverse (12010231402), we get a palindrome (32423432423).

The spelling of 20413201021 in words is "twenty billion, four hundred thirteen million, two hundred one thousand, twenty-one".