1522072221 has 8 divisors (see below), whose sum is σ = 2099410080. Its totient is φ = 979724592.

The previous prime is 1522072171. The next prime is 1522072241. The reversal of 1522072221 is 1222702251.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1522072221 - 2⁷ = 1522072093 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1522072191 and 1522072200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1522072241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8747455 + ... + 8747628.

It is an arithmetic number, because the mean of its divisors is an integer number (262426260).

Almost surely, 2^1522072221 is an apocalyptic number.

It is an amenable number.

1522072221 is a deficient number, since it is larger than the sum of its proper divisors (577337859).

1522072221 is a wasteful number, since it uses less digits than its factorization.

1522072221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17495115.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 1522072221 is about 39013.7440013132. The cubic root of 1522072221 is about 1150.3016778802.

Adding to 1522072221 its reverse (1222702251), we get a palindrome (2744774472).

The spelling of 1522072221 in words is "one billion, five hundred twenty-two million, seventy-two thousand, two hundred twenty-one".