20440621351 has 2 divisors, whose sum is σ = 20440621352. Its totient is φ = 20440621350.

The previous prime is 20440621321. The next prime is 20440621393. The reversal of 20440621351 is 15312604402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20440621351 - 2⁹ = 20440620839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20440621321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220310675 + 10220310676.

It is an arithmetic number, because the mean of its divisors is an integer number (10220310676).

Almost surely, 2^20440621351 is an apocalyptic number.

20440621351 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440621351 is an equidigital number, since it uses as much as digits as its factorization.

20440621351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 20440621351 in words is "twenty billion, four hundred forty million, six hundred twenty-one thousand, three hundred fifty-one".