21124301440 has 64 divisors (see below), whose sum is σ = 55091236320. Its totient is φ = 7681561600.

The previous prime is 21124301431. The next prime is 21124301491. The reversal of 21124301440 is 4410342112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×21124301440² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 1493266 + ... + 1507345.

Almost surely, 2^21124301440 is an apocalyptic number.

21124301440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21124301440 is an abundant number, since it is smaller than the sum of its proper divisors (33966934880).

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

21124301440 is a wasteful number, since it uses less digits than its factorization.

21124301440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000641 (or 3000629 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21124301440 its reverse (4410342112), we get a palindrome (25534643552).

The spelling of 21124301440 in words is "twenty-one billion, one hundred twenty-four million, three hundred one thousand, four hundred forty".