21451355130550 has 48 divisors (see below), whose sum is σ = 39938885154000. Its totient is φ = 8572079577600.

The previous prime is 21451355130493. The next prime is 21451355130559. The reversal of 21451355130550 is 5503155315412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451355130559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307031521 + ... + 307101379.

It is an arithmetic number, because the mean of its divisors is an integer number (832060107375).

Almost surely, 2^{21451355130550} is an apocalyptic number.

21451355130550 is a deficient number, since it is larger than the sum of its proper divisors (18487530023450).

21451355130550 is a wasteful number, since it uses less digits than its factorization.

21451355130550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75841 (or 75836 counting only the distinct ones).

The product of its (nonzero) digits is 225000, while the sum is 40.

The spelling of 21451355130550 in words is "twenty-one trillion, four hundred fifty-one billion, three hundred fifty-five million, one hundred thirty thousand, five hundred fifty".