121240521 has 48 divisors (see below), whose sum is σ = 191258496. Its totient is φ = 73801728.

The previous prime is 121240513. The next prime is 121240529. The reversal of 121240521 is 125042121.

121240521 is a `hidden beast` number, since 121 + 24 + 0 + 521 = 666.

It is an interprime number because it is at equal distance from previous prime (121240513) and next prime (121240529).

It is not a de Polignac number, because 121240521 - 2³ = 121240513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121240494 and 121240503.

It is not an unprimeable number, because it can be changed into a prime (121240529) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 471625 + ... + 471881.

It is an arithmetic number, because the mean of its divisors is an integer number (3984552).

Almost surely, 2^121240521 is an apocalyptic number.

It is an amenable number.

121240521 is a deficient number, since it is larger than the sum of its proper divisors (70017975).

121240521 is a wasteful number, since it uses less digits than its factorization.

121240521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 121240521 is about 11010.9273451422. The cubic root of 121240521 is about 494.9362513558.

Adding to 121240521 its reverse (125042121), we get a palindrome (246282642).

The spelling of 121240521 in words is "one hundred twenty-one million, two hundred forty thousand, five hundred twenty-one".