102121521 has 8 divisors (see below), whose sum is σ = 136385184. Its totient is φ = 67969440.

The previous prime is 102121519. The next prime is 102121531. The reversal of 102121521 is 125121201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 102121521 - 2¹ = 102121519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102121521.

It is not an unprimeable number, because it can be changed into a prime (102121531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25735 + ... + 29436.

It is an arithmetic number, because the mean of its divisors is an integer number (17048148).

Almost surely, 2^102121521 is an apocalyptic number.

It is an amenable number.

102121521 is a deficient number, since it is larger than the sum of its proper divisors (34263663).

102121521 is an equidigital number, since it uses as much as digits as its factorization.

102121521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55791.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 102121521 is about 10105.5193335128. The cubic root of 102121521 is about 467.4183501967.

Adding to 102121521 its reverse (125121201), we get a palindrome (227242722).

The spelling of 102121521 in words is "one hundred two million, one hundred twenty-one thousand, five hundred twenty-one".