20121135 has 8 divisors (see below), whose sum is σ = 32193840. Its totient is φ = 10731264.

The previous prime is 20121121. The next prime is 20121137. The reversal of 20121135 is 53112102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20121135 - 2⁵ = 20121103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 1341409 = 20121135 / (2 + 0 + 1 + 2 + 1 + 1 + 3 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670690 + ... + 670719.

It is an arithmetic number, because the mean of its divisors is an integer number (4024230).

Almost surely, 2^20121135 is an apocalyptic number.

20121135 is a deficient number, since it is larger than the sum of its proper divisors (12072705).

20121135 is a wasteful number, since it uses less digits than its factorization.

20121135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341417.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20121135 is about 4485.6588144887. The cubic root of 20121135 is about 271.9886772608.

Adding to 20121135 its reverse (53112102), we get a palindrome (73233237).

The spelling of 20121135 in words is "twenty million, one hundred twenty-one thousand, one hundred thirty-five".