21533422515340 has 24 divisors (see below), whose sum is σ = 45383437067472. Its totient is φ = 8582273808960.

The previous prime is 21533422515329. The next prime is 21533422515349. The reversal of 21533422515340 is 4351522433512.

It is a junction number, because it is equal to n+sod(n) for n = 21533422515293 and 21533422515302.

It is not an unprimeable number, because it can be changed into a prime (21533422515349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1943444146 + ... + 1943455225.

It is an arithmetic number, because the mean of its divisors is an integer number (1890976544478).

Almost surely, 2^{21533422515340} is an apocalyptic number.

21533422515340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533422515340 is an abundant number, since it is smaller than the sum of its proper divisors (23850014552132).

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

21533422515340 is a wasteful number, since it uses less digits than its factorization.

21533422515340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886899657 (or 3886899655 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 40.

Adding to 21533422515340 its reverse (4351522433512), we get a palindrome (25884944948852).

The spelling of 21533422515340 in words is "twenty-one trillion, five hundred thirty-three billion, four hundred twenty-two million, five hundred fifteen thousand, three hundred forty".