1421522173 has 4 divisors (see below), whose sum is σ = 1426654300. Its totient is φ = 1416390048.

The previous prime is 1421522147. The next prime is 1421522189. The reversal of 1421522173 is 3712251241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3712251241 = 28499 ⋅130259.

It can be written as a sum of positive squares in 2 ways, for example, as 77053284 + 1344468889 = 8778^2 + 36667^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421522173 - 2¹³ = 1421513981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421522273) 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 3 ways as a sum of consecutive naturals, for example, 2565648 + ... + 2566201.

It is an arithmetic number, because the mean of its divisors is an integer number (356663575).

Almost surely, 2^1421522173 is an apocalyptic number.

It is an amenable number.

1421522173 is a deficient number, since it is larger than the sum of its proper divisors (5132127).

1421522173 is an equidigital number, since it uses as much as digits as its factorization.

1421522173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132126.

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

The square root of 1421522173 is about 37703.0790917665. The cubic root of 1421522173 is about 1124.3923429176.

The spelling of 1421522173 in words is "one billion, four hundred twenty-one million, five hundred twenty-two thousand, one hundred seventy-three".