21014404240 has 40 divisors (see below), whose sum is σ = 49182084288. Its totient is φ = 8350089600.

The previous prime is 21014404231. The next prime is 21014404253. The reversal of 21014404240 is 4240441012.

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

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, 857722 + ... + 881881.

Almost surely, 2^21014404240 is an apocalyptic number.

21014404240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21014404240 is an abundant number, since it is smaller than the sum of its proper divisors (28167680048).

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

21014404240 is a wasteful number, since it uses less digits than its factorization.

21014404240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739767 (or 1739761 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21014404240 its reverse (4240441012), we get a palindrome (25254845252).

The spelling of 21014404240 in words is "twenty-one billion, fourteen million, four hundred four thousand, two hundred forty".