121432521 has 16 divisors (see below), whose sum is σ = 185212928. Its totient is φ = 69325200.

The previous prime is 121432469. The next prime is 121432543. The reversal of 121432521 is 125234121.

It is not a de Polignac number, because 121432521 - 2⁷ = 121432393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121432321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28926 + ... + 32856.

It is an arithmetic number, because the mean of its divisors is an integer number (11575808).

Almost surely, 2^121432521 is an apocalyptic number.

It is an amenable number.

121432521 is a deficient number, since it is larger than the sum of its proper divisors (63780407).

121432521 is a wasteful number, since it uses less digits than its factorization.

121432521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5412.

The product of its digits is 480, while the sum is 21.

The square root of 121432521 is about 11019.6425078130. The cubic root of 121432521 is about 495.1973786881.

Adding to 121432521 its reverse (125234121), we get a palindrome (246666642).

The spelling of 121432521 in words is "one hundred twenty-one million, four hundred thirty-two thousand, five hundred twenty-one".