102121531 has 2 divisors, whose sum is σ = 102121532. Its totient is φ = 102121530.

The previous prime is 102121519. The next prime is 102121577. The reversal of 102121531 is 135121201.

It is a weak prime.

It is an emirp because it is prime and its reverse (135121201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102121531 - 2¹¹ = 102119483 is a prime.

It is a super-2 number, since 2×102121531² = 20857614187567922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (102121031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060765 + 51060766.

It is an arithmetic number, because the mean of its divisors is an integer number (51060766).

Almost surely, 2^102121531 is an apocalyptic number.

102121531 is a deficient number, since it is larger than the sum of its proper divisors (1).

102121531 is an equidigital number, since it uses as much as digits as its factorization.

102121531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 102121531 is about 10105.5198282919. The cubic root of 102121531 is about 467.4183654536.

Adding to 102121531 its reverse (135121201), we get a palindrome (237242732).

The spelling of 102121531 in words is "one hundred two million, one hundred twenty-one thousand, five hundred thirty-one".