21411480 has 64 divisors (see below), whose sum is σ = 67622400. Its totient is φ = 5408640.

The previous prime is 21411473. The next prime is 21411487. The reversal of 21411480 is 8411412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21411473) and next prime (21411487).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2416 + ... + 6975.

It is an arithmetic number, because the mean of its divisors is an integer number (1056600).

Almost surely, 2^21411480 is an apocalyptic number.

21411480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21411480 is an abundant number, since it is smaller than the sum of its proper divisors (46210920).

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

21411480 is a wasteful number, since it uses less digits than its factorization.

21411480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9424 (or 9420 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 21411480 is about 4627.2540453275. The cubic root of 21411480 is about 277.6827462773.

Adding to 21411480 its reverse (8411412), we get a palindrome (29822892).

The spelling of 21411480 in words is "twenty-one million, four hundred eleven thousand, four hundred eighty".