21542450355 has 24 divisors (see below), whose sum is σ = 37812914880. Its totient is φ = 11343870720.

The previous prime is 21542450351. The next prime is 21542450387. The reversal of 21542450355 is 55305424512.

21542450355 is a `hidden beast` number, since 2 + 154 + 2 + 450 + 3 + 55 = 666.

It is not a de Polignac number, because 21542450355 - 2² = 21542450351 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21542450351) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3026326 + ... + 3033435.

It is an arithmetic number, because the mean of its divisors is an integer number (1575538120).

Almost surely, 2^21542450355 is an apocalyptic number.

21542450355 is a deficient number, since it is larger than the sum of its proper divisors (16270464525).

21542450355 is a wasteful number, since it uses less digits than its factorization.

21542450355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6059851 (or 6059848 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

Adding to 21542450355 its reverse (55305424512), we get a palindrome (76847874867).

The spelling of 21542450355 in words is "twenty-one billion, five hundred forty-two million, four hundred fifty thousand, three hundred fifty-five".