172021419 has 24 divisors (see below), whose sum is σ = 263671200. Its totient is φ = 107697408.

The previous prime is 172021379. The next prime is 172021429. The reversal of 172021419 is 914120271.

It is not a de Polignac number, because 172021419 - 2¹⁷ = 171890347 is a prime.

It is a super-2 number, since 2×172021419² = 59182737189547122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 172021392 and 172021401.

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 23 ways as a sum of consecutive naturals, for example, 90709 + ... + 92585.

It is an arithmetic number, because the mean of its divisors is an integer number (10986300).

Almost surely, 2^172021419 is an apocalyptic number.

172021419 is a deficient number, since it is larger than the sum of its proper divisors (91649781).

172021419 is a wasteful number, since it uses less digits than its factorization.

172021419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499 (or 2496 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 172021419 is about 13115.6936149027. The cubic root of 172021419 is about 556.1528604685.

The spelling of 172021419 in words is "one hundred seventy-two million, twenty-one thousand, four hundred nineteen".