21411412240 has 40 divisors (see below), whose sum is σ = 51498143640. Its totient is φ = 8269234176.

The previous prime is 21411412213. The next prime is 21411412259. The reversal of 21411412240 is 4221411412.

It can be written as a sum of positive squares in 4 ways, for example, as 2722334976 + 18689077264 = 52176^2 + 136708^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×21411412240² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4612209 + ... + 4616848.

It is an arithmetic number, because the mean of its divisors is an integer number (1287453591).

Almost surely, 2^21411412240 is an apocalyptic number.

21411412240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21411412240 is an abundant number, since it is smaller than the sum of its proper divisors (30086731400).

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

21411412240 is a wasteful number, since it uses less digits than its factorization.

21411412240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9229099 (or 9229093 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21411412240 its reverse (4221411412), we get a palindrome (25632823652).

The spelling of 21411412240 in words is "twenty-one billion, four hundred eleven million, four hundred twelve thousand, two hundred forty".