102212521 has 4 divisors (see below), whose sum is σ = 103017472. Its totient is φ = 101407572.

The previous prime is 102212519. The next prime is 102212527. The reversal of 102212521 is 125212201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102212521 - 2¹ = 102212519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102212495 and 102212504.

It is not an unprimeable number, because it can be changed into a prime (102212527) 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, 402285 + ... + 402538.

It is an arithmetic number, because the mean of its divisors is an integer number (25754368).

Almost surely, 2^102212521 is an apocalyptic number.

It is an amenable number.

102212521 is a deficient number, since it is larger than the sum of its proper divisors (804951).

102212521 is an equidigital number, since it uses as much as digits as its factorization.

102212521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804950.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 102212521 is about 10110.0208209479. The cubic root of 102212521 is about 467.5571470648.

Adding to 102212521 its reverse (125212201), we get a palindrome (227424722).

The spelling of 102212521 in words is "one hundred two million, two hundred twelve thousand, five hundred twenty-one".