121125421 has 4 divisors (see below), whose sum is σ = 121190652. Its totient is φ = 121060192.

The previous prime is 121125419. The next prime is 121125451. The reversal of 121125421 is 124521121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53655625 + 67469796 = 7325^2 + 8214^2 .

It is a cyclic number.

It is not a de Polignac number, because 121125421 - 2¹ = 121125419 is a prime.

It is a super-2 number, since 2×121125421² = 29342735224854482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121125451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29746 + ... + 33571.

It is an arithmetic number, because the mean of its divisors is an integer number (30297663).

Almost surely, 2^121125421 is an apocalyptic number.

It is an amenable number.

121125421 is a deficient number, since it is larger than the sum of its proper divisors (65231).

121125421 is an equidigital number, since it uses as much as digits as its factorization.

121125421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65230.

The product of its digits is 160, while the sum is 19.

The square root of 121125421 is about 11005.6994779978. The cubic root of 121125421 is about 494.7795787657.

Adding to 121125421 its reverse (124521121), we get a palindrome (245646542).

The spelling of 121125421 in words is "one hundred twenty-one million, one hundred twenty-five thousand, four hundred twenty-one".