21404014040 has 16 divisors (see below), whose sum is σ = 48159031680. Its totient is φ = 8561605600.

The previous prime is 21404014019. The next prime is 21404014087. The reversal of 21404014040 is 4041040412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267550136 + ... + 267550215.

It is an arithmetic number, because the mean of its divisors is an integer number (3009939480).

Almost surely, 2^21404014040 is an apocalyptic number.

21404014040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21404014040 is an abundant number, since it is smaller than the sum of its proper divisors (26755017640).

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

21404014040 is a wasteful number, since it uses less digits than its factorization.

21404014040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535100362 (or 535100358 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21404014040 its reverse (4041040412), we get a palindrome (25445054452).

The spelling of 21404014040 in words is "twenty-one billion, four hundred four million, fourteen thousand, forty".