121421135 has 16 divisors (see below), whose sum is σ = 159842592. Its totient is φ = 87811200.

The previous prime is 121421129. The next prime is 121421137. The reversal of 121421135 is 531124121.

It is not a de Polignac number, because 121421135 - 2¹⁰ = 121420111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121421137) 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, 3857 + ... + 16053.

It is an arithmetic number, because the mean of its divisors is an integer number (9990162).

Almost surely, 2^121421135 is an apocalyptic number.

121421135 is a deficient number, since it is larger than the sum of its proper divisors (38421457).

121421135 is a wasteful number, since it uses less digits than its factorization.

121421135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12394.

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

The square root of 121421135 is about 11019.1258727723. The cubic root of 121421135 is about 495.1819009739.

Adding to 121421135 its reverse (531124121), we get a palindrome (652545256).

The spelling of 121421135 in words is "one hundred twenty-one million, four hundred twenty-one thousand, one hundred thirty-five".