172101020 has 48 divisors (see below), whose sum is σ = 444819648. Its totient is φ = 54466560.

The previous prime is 172101001. The next prime is 172101049. The reversal of 172101020 is 20101271.

It is a super-2 number, since 2×172101020² = 59237522170080800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 172100986 and 172101004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45461 + ... + 49100.

It is an arithmetic number, because the mean of its divisors is an integer number (9267076).

Almost surely, 2^172101020 is an apocalyptic number.

172101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172101020 is an abundant number, since it is smaller than the sum of its proper divisors (272718628).

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

172101020 is a wasteful number, since it uses less digits than its factorization.

172101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94590 (or 94588 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 172101020 is about 13118.7278346645. The cubic root of 172101020 is about 556.2386317586.

Adding to 172101020 its reverse (20101271), we get a palindrome (192202291).

The spelling of 172101020 in words is "one hundred seventy-two million, one hundred one thousand, twenty".