1522670221 has 2 divisors, whose sum is σ = 1522670222. Its totient is φ = 1522670220.

The previous prime is 1522670209. The next prime is 1522670249. The reversal of 1522670221 is 1220762251.

It is an a-pointer prime, because the next prime (1522670249) can be obtained adding 1522670221 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1520142121 + 2528100 = 38989^2 + 1590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1522670221 - 2²¹ = 1520573069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1522670221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1522670521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761335110 + 761335111.

It is an arithmetic number, because the mean of its divisors is an integer number (761335111).

Almost surely, 2^1522670221 is an apocalyptic number.

It is an amenable number.

1522670221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1522670221 is an equidigital number, since it uses as much as digits as its factorization.

1522670221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1522670221 is about 39021.4072145021. The cubic root of 1522670221 is about 1150.4523037457.

The spelling of 1522670221 in words is "one billion, five hundred twenty-two million, six hundred seventy thousand, two hundred twenty-one".