3215421 has 12 divisors (see below), whose sum is σ = 5066880. Its totient is φ = 1948680.

The previous prime is 3215417. The next prime is 3215447. The reversal of 3215421 is 1245123.

Added to its reverse (1245123) it gives a square (4460544 = 2112²).

It is not a de Polignac number, because 3215421 - 2² = 3215417 is a prime.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 3215394 and 3215403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3215021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16141 + ... + 16338.

It is an arithmetic number, because the mean of its divisors is an integer number (422240).

Almost surely, 2^3215421 is an apocalyptic number.

It is an amenable number.

3215421 is a deficient number, since it is larger than the sum of its proper divisors (1851459).

3215421 is a wasteful number, since it uses less digits than its factorization.

3215421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32496 (or 32493 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 3215421 is about 1793.1595021079. The cubic root of 3215421 is about 147.5975950872.

Adding to 3215421 its reverse (1245123), we get a square (4460544 = 2112²).

The spelling of 3215421 in words is "three million, two hundred fifteen thousand, four hundred twenty-one".