102141521 has 4 divisors (see below), whose sum is σ = 102464052. Its totient is φ = 101818992.

The previous prime is 102141499. The next prime is 102141553. The reversal of 102141521 is 125141201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125141201 = 19 ⋅6586379.

It can be written as a sum of positive squares in 2 ways, for example, as 23571025 + 78570496 = 4855^2 + 8864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102141521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 102141521.

It is not an unprimeable number, because it can be changed into a prime (102141421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160790 + ... + 161423.

It is an arithmetic number, because the mean of its divisors is an integer number (25616013).

Almost surely, 2^102141521 is an apocalyptic number.

It is an amenable number.

102141521 is a deficient number, since it is larger than the sum of its proper divisors (322531).

102141521 is an equidigital number, since it uses as much as digits as its factorization.

102141521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322530.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 102141521 is about 10106.5088433148. The cubic root of 102141521 is about 467.4488620702.

Adding to 102141521 its reverse (125141201), we get a palindrome (227282722).

The spelling of 102141521 in words is "one hundred two million, one hundred forty-one thousand, five hundred twenty-one".