21041372 has 12 divisors (see below), whose sum is σ = 40169976. Its totient is φ = 9564240.

The previous prime is 21041369. The next prime is 21041381. The reversal of 21041372 is 27314012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239063 + ... + 239150.

It is an arithmetic number, because the mean of its divisors is an integer number (3347498).

Almost surely, 2^21041372 is an apocalyptic number.

21041372 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21041372 is a deficient number, since it is larger than the sum of its proper divisors (19128604).

21041372 is a wasteful number, since it uses less digits than its factorization.

21041372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478228 (or 478226 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21041372 is about 4587.0875291409. The cubic root of 21041372 is about 276.0734769015.

Adding to 21041372 its reverse (27314012), we get a palindrome (48355384).

The spelling of 21041372 in words is "twenty-one million, forty-one thousand, three hundred seventy-two".