172421000 has 32 divisors (see below), whose sum is σ = 403467480. Its totient is φ = 68968000.

The previous prime is 172420993. The next prime is 172421003. The reversal of 172421000 is 124271.

172421000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 111049444 + 61371556 = 10538^2 + 7834^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 172421000.

It is not an unprimeable number, because it can be changed into a prime (172421003) 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, 85211 + ... + 87210.

Almost surely, 2^172421000 is an apocalyptic number.

172421000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172421000 is an abundant number, since it is smaller than the sum of its proper divisors (231046480).

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

172421000 is a wasteful number, since it uses less digits than its factorization.

172421000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172442 (or 172428 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 172421000 is about 13130.9177135492. The cubic root of 172421000 is about 556.5831484934.

Adding to 172421000 its reverse (124271), we get a palindrome (172545271).

The spelling of 172421000 in words is "one hundred seventy-two million, four hundred twenty-one thousand".