3215421533 has 4 divisors (see below), whose sum is σ = 3216917148. Its totient is φ = 3213925920.

The previous prime is 3215421511. The next prime is 3215421553. The reversal of 3215421533 is 3351245123.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3351245123 = 35089 ⋅95507.

It can be written as a sum of positive squares in 2 ways, for example, as 577777369 + 2637644164 = 24037^2 + 51358^2 .

It is a cyclic number.

It is not a de Polignac number, because 3215421533 - 2¹² = 3215417437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3215421496 and 3215421505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3215421553) 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, 744578 + ... + 748883.

It is an arithmetic number, because the mean of its divisors is an integer number (804229287).

Almost surely, 2^3215421533 is an apocalyptic number.

It is an amenable number.

3215421533 is a deficient number, since it is larger than the sum of its proper divisors (1495615).

3215421533 is a wasteful number, since it uses less digits than its factorization.

3215421533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495614.

The product of its digits is 10800, while the sum is 29.

The square root of 3215421533 is about 56704.6870461340. The cubic root of 3215421533 is about 1475.9760324261.

Adding to 3215421533 its reverse (3351245123), we get a palindrome (6566666656).

The spelling of 3215421533 in words is "three billion, two hundred fifteen million, four hundred twenty-one thousand, five hundred thirty-three".