20121451 has 8 divisors (see below), whose sum is σ = 23617760. Its totient is φ = 16780608.

The previous prime is 20121433. The next prime is 20121467. The reversal of 20121451 is 15412102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121451 - 2⁹ = 20120939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38586 + ... + 39103.

It is an arithmetic number, because the mean of its divisors is an integer number (2952220).

Almost surely, 2^20121451 is an apocalyptic number.

20121451 is a deficient number, since it is larger than the sum of its proper divisors (3496309).

20121451 is an equidigital number, since it uses as much as digits as its factorization.

20121451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77733.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 20121451 is about 4485.6940377159. The cubic root of 20121451 is about 271.9901011031.

Adding to 20121451 its reverse (15412102), we get a palindrome (35533553).

The spelling of 20121451 in words is "twenty million, one hundred twenty-one thousand, four hundred fifty-one".