21001552525043 has 2 divisors, whose sum is σ = 21001552525044. Its totient is φ = 21001552525042.

The previous prime is 21001552524989. The next prime is 21001552525081. The reversal of 21001552525043 is 34052525510012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001552525043 - 2¹² = 21001552520947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001552524994 and 21001552525012.

It is not a weakly prime, because it can be changed into another prime (21001552555043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500776262521 + 10500776262522.

It is an arithmetic number, because the mean of its divisors is an integer number (10500776262522).

Almost surely, 2^{21001552525043} is an apocalyptic number.

21001552525043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001552525043 is an equidigital number, since it uses as much as digits as its factorization.

21001552525043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60000, while the sum is 35.

The spelling of 21001552525043 in words is "twenty-one trillion, one billion, five hundred fifty-two million, five hundred twenty-five thousand, forty-three".