121421145 has 32 divisors (see below), whose sum is σ = 199366272. Its totient is φ = 63078912.

The previous prime is 121421137. The next prime is 121421159. The reversal of 121421145 is 541124121.

It is not a de Polignac number, because 121421145 - 2³ = 121421137 is a prime.

It is a super-2 number, since 2×121421145² = 29486188906222050, which contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 129117 + ... + 130053.

It is an arithmetic number, because the mean of its divisors is an integer number (6230196).

Almost surely, 2^121421145 is an apocalyptic number.

121421145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121421145 is a deficient number, since it is larger than the sum of its proper divisors (77945127).

121421145 is a wasteful number, since it uses less digits than its factorization.

121421145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161.

The product of its digits is 320, while the sum is 21.

The square root of 121421145 is about 11019.1263265288. The cubic root of 121421145 is about 495.1819145679.

Adding to 121421145 its reverse (541124121), we get a palindrome (662545266).

The spelling of 121421145 in words is "one hundred twenty-one million, four hundred twenty-one thousand, one hundred forty-five".