121420521 has 24 divisors (see below), whose sum is σ = 181598976. Its totient is φ = 78095520.

The previous prime is 121420501. The next prime is 121420553. The reversal of 121420521 is 125024121.

121420521 is a `hidden beast` number, since 1 + 2 + 142 + 0 + 521 = 666.

It is not a de Polignac number, because 121420521 - 2⁹ = 121420009 is a prime.

It is a super-2 number, since 2×121420521² = 29485885839822882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121420494 and 121420503.

It is not an unprimeable number, because it can be changed into a prime (121420501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156691 + ... + 157463.

It is an arithmetic number, because the mean of its divisors is an integer number (7566624).

Almost surely, 2^121420521 is an apocalyptic number.

It is an amenable number.

121420521 is a deficient number, since it is larger than the sum of its proper divisors (60178455).

121420521 is a wasteful number, since it uses less digits than its factorization.

121420521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373 (or 1370 counting only the distinct ones).

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

The square root of 121420521 is about 11019.0980120879. The cubic root of 121420521 is about 495.1810662971.

Adding to 121420521 its reverse (125024121), we get a palindrome (246444642).

The spelling of 121420521 in words is "one hundred twenty-one million, four hundred twenty thousand, five hundred twenty-one".