16121003501 has 4 divisors (see below), whose sum is σ = 16641035904. Its totient is φ = 15600971100.

The previous prime is 16121003497. The next prime is 16121003513. The reversal of 16121003501 is 10530012161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10530012161 = 1231 ⋅8554031.

It is a cyclic number.

It is not a de Polignac number, because 16121003501 - 2² = 16121003497 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16121003551) 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, 260016155 + ... + 260016216.

It is an arithmetic number, because the mean of its divisors is an integer number (4160258976).

Almost surely, 2^16121003501 is an apocalyptic number.

It is an amenable number.

16121003501 is a deficient number, since it is larger than the sum of its proper divisors (520032403).

16121003501 is an equidigital number, since it uses as much as digits as its factorization.

16121003501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520032402.

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 16121003501 its reverse (10530012161), we get a palindrome (26651015662).

The spelling of 16121003501 in words is "sixteen billion, one hundred twenty-one million, three thousand, five hundred one".