102001253444521 has 4 divisors (see below), whose sum is σ = 102173262304212. Its totient is φ = 101829244584832.

The previous prime is 102001253444513. The next prime is 102001253444557. The reversal of 102001253444521 is 125444352100201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41255378611225 + 60745874833296 = 6423035^2 + 7793964^2 .

It is a cyclic number.

It is not a de Polignac number, because 102001253444521 - 2³ = 102001253444513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102001253444501) 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 in 3 ways as a sum of consecutive naturals, for example, 86004428956 + ... + 86004430141.

It is an arithmetic number, because the mean of its divisors is an integer number (25543315576053).

Almost surely, 2^{102001253444521} is an apocalyptic number.

It is an amenable number.

102001253444521 is a deficient number, since it is larger than the sum of its proper divisors (172008859691).

102001253444521 is an equidigital number, since it uses as much as digits as its factorization.

102001253444521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172008859690.

The product of its (nonzero) digits is 38400, while the sum is 34.

The spelling of 102001253444521 in words is "one hundred two trillion, one billion, two hundred fifty-three million, four hundred forty-four thousand, five hundred twenty-one".