172021413 has 8 divisors (see below), whose sum is σ = 229433728. Its totient is φ = 114645024.

The previous prime is 172021379. The next prime is 172021429. The reversal of 172021413 is 314120271.

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

It is not a de Polignac number, because 172021413 - 2⁶ = 172021349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 172021413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172021463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5556 + ... + 19362.

It is an arithmetic number, because the mean of its divisors is an integer number (28679216).

Almost surely, 2^172021413 is an apocalyptic number.

It is an amenable number.

172021413 is a deficient number, since it is larger than the sum of its proper divisors (57412315).

172021413 is a wasteful number, since it uses less digits than its factorization.

172021413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17963.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 172021413 is about 13115.6933861691. The cubic root of 172021413 is about 556.1528540024.

Adding to 172021413 its reverse (314120271), we get a palindrome (486141684).

The spelling of 172021413 in words is "one hundred seventy-two million, twenty-one thousand, four hundred thirteen".