21355352524440 has 384 divisors, whose sum is σ = 82932650798400. Its totient is φ = 4704504053760.

The previous prime is 21355352524427. The next prime is 21355352524477. The reversal of 21355352524440 is 4442525355312.

21355352524440 is a `hidden beast` number, since 2 + 1 + 3 + 55 + 35 + 2 + 524 + 4 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3517057 + ... + 7421616.

Almost surely, 2^{21355352524440} is an apocalyptic number.

21355352524440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21355352524440 is an abundant number, since it is smaller than the sum of its proper divisors (61577298273960).

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

21355352524440 is a wasteful number, since it uses less digits than its factorization.

21355352524440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10938747 (or 10938740 counting only the distinct ones).

The product of its (nonzero) digits is 2880000, while the sum is 45.

Adding to 21355352524440 its reverse (4442525355312), we get a palindrome (25797877879752).

The spelling of 21355352524440 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred fifty-two million, five hundred twenty-four thousand, four hundred forty".