21455302546 has 8 divisors (see below), whose sum is σ = 32387941260. Its totient is φ = 10659322128.

The previous prime is 21455302513. The next prime is 21455302559. The reversal of 21455302546 is 64520355412.

It can be written as a sum of positive squares in 2 ways, for example, as 20051976025 + 1403326521 = 141605^2 + 37461^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34164181 + ... + 34164808.

Almost surely, 2^21455302546 is an apocalyptic number.

21455302546 is a deficient number, since it is larger than the sum of its proper divisors (10932638714).

21455302546 is a wasteful number, since it uses less digits than its factorization.

21455302546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68329148.

The product of its (nonzero) digits is 144000, while the sum is 37.

Adding to 21455302546 its reverse (64520355412), we get a palindrome (85975657958).

The spelling of 21455302546 in words is "twenty-one billion, four hundred fifty-five million, three hundred two thousand, five hundred forty-six".