21545154005 has 8 divisors (see below), whose sum is σ = 26745708600. Its totient is φ = 16641774016.

The previous prime is 21545153963. The next prime is 21545154013. The reversal of 21545154005 is 50045154512.

It can be written as a sum of positive squares in 4 ways, for example, as 2617447921 + 18927706084 = 51161^2 + 137578^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21545154005 - 2¹² = 21545149909 is a prime.

It is a super-2 number, since 2×21545154005² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74293490 + ... + 74293779.

It is an arithmetic number, because the mean of its divisors is an integer number (3343213575).

Almost surely, 2^21545154005 is an apocalyptic number.

It is an amenable number.

21545154005 is a deficient number, since it is larger than the sum of its proper divisors (5200554595).

21545154005 is a wasteful number, since it uses less digits than its factorization.

21545154005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148587303.

The product of its (nonzero) digits is 20000, while the sum is 32.

The spelling of 21545154005 in words is "twenty-one billion, five hundred forty-five million, one hundred fifty-four thousand, five".