21341040 has 80 divisors (see below), whose sum is σ = 75614208. Its totient is φ = 4877568.

The previous prime is 21341017. The next prime is 21341053. The reversal of 21341040 is 4014312.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a congruent number.

It is an unprimeable number.

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, 4672 + ... + 8031.

Almost surely, 2^21341040 is an apocalyptic number.

21341040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21341040 is an abundant number, since it is smaller than the sum of its proper divisors (54273168).

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

21341040 is a wasteful number, since it uses less digits than its factorization.

21341040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12726 (or 12720 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21341040 is about 4619.6363493245. The cubic root of 21341040 is about 277.3779026209.

Adding to 21341040 its reverse (4014312), we get a palindrome (25355352).

The spelling of 21341040 in words is "twenty-one million, three hundred forty-one thousand, forty".