21452435134440 has 64 divisors (see below), whose sum is σ = 64462293072000. Its totient is φ = 5711317132032.

The previous prime is 21452435134433. The next prime is 21452435134453. The reversal of 21452435134440 is 4443153425412.

It is a super-2 number, since 2×21452435134440² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21452435134392 and 21452435134401.

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, 145742340 + ... + 145889459.

It is an arithmetic number, because the mean of its divisors is an integer number (1007223329250).

Almost surely, 2^{21452435134440} is an apocalyptic number.

21452435134440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21452435134440 is an abundant number, since it is smaller than the sum of its proper divisors (43009857937560).

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

21452435134440 is a wasteful number, since it uses less digits than its factorization.

21452435134440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291632426 (or 291632422 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 42.

Adding to 21452435134440 its reverse (4443153425412), we get a palindrome (25895588559852).

The spelling of 21452435134440 in words is "twenty-one trillion, four hundred fifty-two billion, four hundred thirty-five million, one hundred thirty-four thousand, four hundred forty".