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121521 = 340507
BaseRepresentation
bin11101101010110001
320011200210
4131222301
512342041
62334333
71014201
oct355261
9204623
10121521
1183334
125a3a9
134340a
1432401
1526016
hex1dab1

121521 has 4 divisors (see below), whose sum is σ = 162032. Its totient is φ = 81012.

The previous prime is 121507. The next prime is 121523. The reversal of 121521 is 125121.

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 not a de Polignac number, because 121521 - 213 = 113329 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121497 and 121506.

It is not an unprimeable number, because it can be changed into a prime (121523) 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, 20251 + ... + 20256.

It is an arithmetic number, because the mean of its divisors is an integer number (40508).

2121521 is an apocalyptic number.

It is an amenable number.

121521 is a deficient number, since it is larger than the sum of its proper divisors (40511).

121521 is an equidigital number, since it uses as much as digits as its factorization.

121521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40510.

The product of its digits is 20, while the sum is 12.

The square root of 121521 is about 348.5986230610. The cubic root of 121521 is about 49.5317620864.

Adding to 121521 its reverse (125121), we get a palindrome (246642).

Subtracting 121521 from its reverse (125121), we obtain a square (3600 = 602).

The spelling of 121521 in words is "one hundred twenty-one thousand, five hundred twenty-one".

Divisors: 1 3 40507 121521