21451130355 has 16 divisors (see below), whose sum is σ = 34324439040. Its totient is φ = 11439726048.

The previous prime is 21451130317. The next prime is 21451130413. The reversal of 21451130355 is 55303115412.

It is not a de Polignac number, because 21451130355 - 2¹² = 21451126259 is a prime.

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, 179854 + ... + 274316.

It is an arithmetic number, because the mean of its divisors is an integer number (2145277440).

Almost surely, 2^21451130355 is an apocalyptic number.

21451130355 is a deficient number, since it is larger than the sum of its proper divisors (12873308685).

21451130355 is a wasteful number, since it uses less digits than its factorization.

21451130355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109610.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 21451130355 its reverse (55303115412), we get a palindrome (76754245767).

The spelling of 21451130355 in words is "twenty-one billion, four hundred fifty-one million, one hundred thirty thousand, three hundred fifty-five".