21360655404 has 144 divisors (see below), whose sum is σ = 62895216384. Its totient is φ = 6047395200.

The previous prime is 21360655387. The next prime is 21360655409. The reversal of 21360655404 is 40455606312.

21360655404 is a `hidden beast` number, since 2 + 1 + 3 + 606 + 5 + 5 + 40 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21360655409) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 364374 + ... + 418914.

It is an arithmetic number, because the mean of its divisors is an integer number (436772336).

Almost surely, 2^21360655404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21360655404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31447608192).

21360655404 is an abundant number, since it is smaller than the sum of its proper divisors (41534560980).

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

21360655404 is a wasteful number, since it uses less digits than its factorization.

21360655404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54628 (or 54623 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 21360655404 in words is "twenty-one billion, three hundred sixty million, six hundred fifty-five thousand, four hundred four".