20401420321 has 2 divisors, whose sum is σ = 20401420322. Its totient is φ = 20401420320.

The previous prime is 20401420307. The next prime is 20401420339. The reversal of 20401420321 is 12302410402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19615403025 + 786017296 = 140055^2 + 28036^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401420321 - 2⁵ = 20401420289 is a prime.

It is a super-2 number, since 2×20401420321² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20401420301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200710160 + 10200710161.

It is an arithmetic number, because the mean of its divisors is an integer number (10200710161).

Almost surely, 2^20401420321 is an apocalyptic number.

It is an amenable number.

20401420321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401420321 is an equidigital number, since it uses as much as digits as its factorization.

20401420321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20401420321 its reverse (12302410402), we get a palindrome (32703830723).

The spelling of 20401420321 in words is "twenty billion, four hundred one million, four hundred twenty thousand, three hundred twenty-one".