3521450021 has 4 divisors (see below), whose sum is σ = 3521575392. Its totient is φ = 3521324652.

The previous prime is 3521450017. The next prime is 3521450033. The reversal of 3521450021 is 1200541253.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1200541253 = 193 ⋅6220421.

It is a cyclic number.

It is not a de Polignac number, because 3521450021 - 2² = 3521450017 is a prime.

It is a super-2 number, since 2×3521450021² = 24801220500801800882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3521459021) 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 3 ways as a sum of consecutive naturals, for example, 1046 + ... + 83928.

It is an arithmetic number, because the mean of its divisors is an integer number (880393848).

Almost surely, 2^3521450021 is an apocalyptic number.

It is an amenable number.

3521450021 is a deficient number, since it is larger than the sum of its proper divisors (125371).

3521450021 is an equidigital number, since it uses as much as digits as its factorization.

3521450021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125370.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 3521450021 is about 59341.8066880340. The cubic root of 3521450021 is about 1521.3898329376.

Adding to 3521450021 its reverse (1200541253), we get a palindrome (4721991274).

The spelling of 3521450021 in words is "three billion, five hundred twenty-one million, four hundred fifty thousand, twenty-one".