25043321501021 has 2 divisors, whose sum is σ = 25043321501022. Its totient is φ = 25043321501020.

The previous prime is 25043321500993. The next prime is 25043321501071. The reversal of 25043321501021 is 12010512334052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20453503728025 + 4589817772996 = 4522555^2 + 2142386^2 .

It is a cyclic number.

It is not a de Polignac number, because 25043321501021 - 2¹⁰ = 25043321499997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25043321501071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12521660750510 + 12521660750511.

It is an arithmetic number, because the mean of its divisors is an integer number (12521660750511).

Almost surely, 2^{25043321501021} is an apocalyptic number.

It is an amenable number.

25043321501021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25043321501021 is an equidigital number, since it uses as much as digits as its factorization.

25043321501021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 25043321501021 its reverse (12010512334052), we get a palindrome (37053833835073).

The spelling of 25043321501021 in words is "twenty-five trillion, forty-three billion, three hundred twenty-one million, five hundred one thousand, twenty-one".