102521621145764 has 6 divisors (see below), whose sum is σ = 179412837005094. Its totient is φ = 51260810572880.

The previous prime is 102521621145763. The next prime is 102521621145773. The reversal of 102521621145764 is 467541126125201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 102256427044864 + 265194100900 = 10112192^2 + 514970^2 .

It is not an unprimeable number, because it can be changed into a prime (102521621145761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12815202643217 + ... + 12815202643224.

It is an arithmetic number, because the mean of its divisors is an integer number (29902139500849).

Almost surely, 2^{102521621145764} is an apocalyptic number.

It is an amenable number.

102521621145764 is a deficient number, since it is larger than the sum of its proper divisors (76891215859330).

102521621145764 is a wasteful number, since it uses less digits than its factorization.

102521621145764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25630405286445 (or 25630405286443 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 102521621145764 in words is "one hundred two trillion, five hundred twenty-one billion, six hundred twenty-one million, one hundred forty-five thousand, seven hundred sixty-four".