172021422 has 16 divisors (see below), whose sum is σ = 344218320. Its totient is φ = 57311232.

The previous prime is 172021379. The next prime is 172021429. The reversal of 172021422 is 224120271.

It is a super-3 number, since 3×172021422³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172021429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7854 + ... + 20142.

It is an arithmetic number, because the mean of its divisors is an integer number (21513645).

Almost surely, 2^172021422 is an apocalyptic number.

172021422 is an abundant number, since it is smaller than the sum of its proper divisors (172196898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172021422 is a wasteful number, since it uses less digits than its factorization.

172021422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14627.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 172021422 is about 13115.6937292695. The cubic root of 172021422 is about 556.1528637016.

Adding to 172021422 its reverse (224120271), we get a palindrome (396141693).

The spelling of 172021422 in words is "one hundred seventy-two million, twenty-one thousand, four hundred twenty-two".