21272190 has 32 divisors (see below), whose sum is σ = 51217056. Its totient is φ = 5654400.

The previous prime is 21272189. The next prime is 21272213. The reversal of 21272190 is 9127212.

It is a super-3 number, since 3×21272190³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21272190.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10240 + ... + 12140.

It is an arithmetic number, because the mean of its divisors is an integer number (1600533).

Almost surely, 2^21272190 is an apocalyptic number.

21272190 is an abundant number, since it is smaller than the sum of its proper divisors (29944866).

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

21272190 is a wasteful number, since it uses less digits than its factorization.

21272190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21272190 is about 4612.1784440761. The cubic root of 21272190 is about 277.0792910761.

The spelling of 21272190 in words is "twenty-one million, two hundred seventy-two thousand, one hundred ninety".