201125421 has 24 divisors (see below), whose sum is σ = 332392320. Its totient is φ = 114798816.

The previous prime is 201125413. The next prime is 201125429. The reversal of 201125421 is 124521102.

It is an interprime number because it is at equal distance from previous prime (201125413) and next prime (201125429).

It is not a de Polignac number, because 201125421 - 2³ = 201125413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201125394 and 201125403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201125429) 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 23 ways as a sum of consecutive naturals, for example, 96175 + ... + 98243.

It is an arithmetic number, because the mean of its divisors is an integer number (13849680).

Almost surely, 2^201125421 is an apocalyptic number.

201125421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201125421 is a deficient number, since it is larger than the sum of its proper divisors (131266899).

201125421 is a wasteful number, since it uses less digits than its factorization.

201125421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3625 (or 3622 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 201125421 is about 14181.8694465857. The cubic root of 201125421 is about 585.8984135506.

Adding to 201125421 its reverse (124521102), we get a palindrome (325646523).

The spelling of 201125421 in words is "two hundred one million, one hundred twenty-five thousand, four hundred twenty-one".