121421531 has 64 divisors (see below), whose sum is σ = 173352960. Its totient is φ = 82114560.

The previous prime is 121421519. The next prime is 121421563. The reversal of 121421531 is 135124121.

It is not a de Polignac number, because 121421531 - 2¹⁴ = 121405147 is a prime.

It is a super-2 number, since 2×121421531² = 29486376380767922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121421581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1113905 + ... + 1114013.

It is an arithmetic number, because the mean of its divisors is an integer number (2708640).

Almost surely, 2^121421531 is an apocalyptic number.

121421531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121421531 is a deficient number, since it is larger than the sum of its proper divisors (51931429).

121421531 is a wasteful number, since it uses less digits than its factorization.

121421531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204.

The product of its digits is 240, while the sum is 20.

The square root of 121421531 is about 11019.1438415151. The cubic root of 121421531 is about 495.1824392981.

Adding to 121421531 its reverse (135124121), we get a palindrome (256545652).

The spelling of 121421531 in words is "one hundred twenty-one million, four hundred twenty-one thousand, five hundred thirty-one".