21533454342420 has 48 divisors (see below), whose sum is σ = 60394329475200. Its totient is φ = 5732668080256.

The previous prime is 21533454342391. The next prime is 21533454342431. The reversal of 21533454342420 is 2424345433512.

It is a super-2 number, since 2×21533454342420² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299539107 + ... + 299610986.

It is an arithmetic number, because the mean of its divisors is an integer number (1258215197400).

Almost surely, 2^{21533454342420} is an apocalyptic number.

21533454342420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533454342420 is an abundant number, since it is smaller than the sum of its proper divisors (38860875132780).

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

21533454342420 is a wasteful number, since it uses less digits than its factorization.

21533454342420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599150704 (or 599150702 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 42.

Adding to 21533454342420 its reverse (2424345433512), we get a palindrome (23957799775932).

The spelling of 21533454342420 in words is "twenty-one trillion, five hundred thirty-three billion, four hundred fifty-four million, three hundred forty-two thousand, four hundred twenty".