21533423055540 has 96 divisors (see below), whose sum is σ = 65775553998336. Its totient is φ = 5220165479040.

The previous prime is 21533423055479. The next prime is 21533423055541. The reversal of 21533423055540 is 4555032433512.

It is a junction number, because it is equal to n+sod(n) for n = 21533423055492 and 21533423055501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21533423055541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104548699 + ... + 104754461.

It is an arithmetic number, because the mean of its divisors is an integer number (685162020816).

Almost surely, 2^{21533423055540} is an apocalyptic number.

21533423055540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533423055540 is an abundant number, since it is smaller than the sum of its proper divisors (44242130942796).

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

21533423055540 is a wasteful number, since it uses less digits than its factorization.

21533423055540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364349 (or 364347 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 42.

The spelling of 21533423055540 in words is "twenty-one trillion, five hundred thirty-three billion, four hundred twenty-three million, fifty-five thousand, five hundred forty".