21272010 has 32 divisors (see below), whose sum is σ = 53274240. Its totient is φ = 5425728.

The previous prime is 21271973. The next prime is 21272011. The reversal of 21272010 is 1027212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (21272011) by changing a digit.

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, 14725 + ... + 16104.

It is an arithmetic number, because the mean of its divisors is an integer number (1664820).

Almost surely, 2^21272010 is an apocalyptic number.

21272010 is an abundant number, since it is smaller than the sum of its proper divisors (32002230).

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

21272010 is a wasteful number, since it uses less digits than its factorization.

21272010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30862.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 21272010 is about 4612.1589304793. The cubic root of 21272010 is about 277.0785095485.

Adding to 21272010 its reverse (1027212), we get a palindrome (22299222).

The spelling of 21272010 in words is "twenty-one million, two hundred seventy-two thousand, ten".