3215605021 has 2 divisors, whose sum is σ = 3215605022. Its totient is φ = 3215605020.

The previous prime is 3215605009. The next prime is 3215605027. The reversal of 3215605021 is 1205065123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2620928025 + 594676996 = 51195^2 + 24386^2 .

It is an emirp because it is prime and its reverse (1205065123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3215605021 - 2¹³ = 3215596829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3215605027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1607802510 + 1607802511.

It is an arithmetic number, because the mean of its divisors is an integer number (1607802511).

Almost surely, 2^3215605021 is an apocalyptic number.

It is an amenable number.

3215605021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3215605021 is an equidigital number, since it uses as much as digits as its factorization.

3215605021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 3215605021 is about 56706.3049492735. The cubic root of 3215605021 is about 1476.0041074116.

The spelling of 3215605021 in words is "three billion, two hundred fifteen million, six hundred five thousand, twenty-one".