21401411440 has 40 divisors (see below), whose sum is σ = 49771912608. Its totient is φ = 8558219520.

The previous prime is 21401411429. The next prime is 21401411453. The reversal of 21401411440 is 4411410412.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273525 + ... + 342955.

Almost surely, 2^21401411440 is an apocalyptic number.

21401411440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21401411440 is an abundant number, since it is smaller than the sum of its proper divisors (28370501168).

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

21401411440 is a wasteful number, since it uses less digits than its factorization.

21401411440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73297 (or 73291 counting only the distinct ones).

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

Adding to 21401411440 its reverse (4411410412), we get a palindrome (25812821852).

The spelling of 21401411440 in words is "twenty-one billion, four hundred one million, four hundred eleven thousand, four hundred forty".