21172060 has 48 divisors (see below), whose sum is σ = 54726336. Its totient is φ = 6700032.

The previous prime is 21172057. The next prime is 21172087. The reversal of 21172060 is 6027112.

It is a super-3 number, since 3×21172060³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3997 + ... + 7636.

It is an arithmetic number, because the mean of its divisors is an integer number (1140132).

Almost surely, 2^21172060 is an apocalyptic number.

21172060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21172060 is an abundant number, since it is smaller than the sum of its proper divisors (33554276).

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

21172060 is a wasteful number, since it uses less digits than its factorization.

21172060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11662 (or 11660 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21172060 is about 4601.3106828381. The cubic root of 21172060 is about 276.6438619290.

Adding to 21172060 its reverse (6027112), we get a palindrome (27199172).

The spelling of 21172060 in words is "twenty-one million, one hundred seventy-two thousand, sixty".