16121451 has 8 divisors (see below), whose sum is σ = 21767680. Its totient is φ = 10611432.

The previous prime is 16121449. The next prime is 16121453. The reversal of 16121451 is 15412161.

It is an interprime number because it is at equal distance from previous prime (16121449) and next prime (16121453).

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

It is not a de Polignac number, because 16121451 - 2¹ = 16121449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16121453) 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, 33775 + ... + 34248.

It is an arithmetic number, because the mean of its divisors is an integer number (2720960).

Almost surely, 2^16121451 is an apocalyptic number.

16121451 is a deficient number, since it is larger than the sum of its proper divisors (5646229).

16121451 is an equidigital number, since it uses as much as digits as its factorization.

16121451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68105.

The product of its digits is 240, while the sum is 21.

The square root of 16121451 is about 4015.1526745567. The cubic root of 16121451 is about 252.6201813274.

It can be divided in two parts, 161 and 21451, that added together give a palindrome (21612).

The spelling of 16121451 in words is "sixteen million, one hundred twenty-one thousand, four hundred fifty-one".