21741080 has 32 divisors (see below), whose sum is σ = 49083840. Its totient is φ = 8666880.

The previous prime is 21741067. The next prime is 21741107. The reversal of 21741080 is 8014712.

21741080 = T₁₄₄ + T₁₄₅ + ... + T₅₁₀.

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 7 ways as a sum of consecutive naturals, for example, 13940 + ... + 15420.

It is an arithmetic number, because the mean of its divisors is an integer number (1533870).

Almost surely, 2^21741080 is an apocalyptic number.

21741080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21741080 is an abundant number, since it is smaller than the sum of its proper divisors (27342760).

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

21741080 is a wasteful number, since it uses less digits than its factorization.

21741080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859 (or 1855 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 21741080 is about 4662.7331040925. The cubic root of 21741080 is about 279.1003437407.

Adding to 21741080 its reverse (8014712), we get a palindrome (29755792).

The spelling of 21741080 in words is "twenty-one million, seven hundred forty-one thousand, eighty".