21122010545 has 8 divisors (see below), whose sum is σ = 25354765800. Its totient is φ = 16892039680.

The previous prime is 21122010491. The next prime is 21122010577. The reversal of 21122010545 is 54501022112.

It can be written as a sum of positive squares in 4 ways, for example, as 8859327376 + 12262683169 = 94124^2 + 110737^2 .

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

It is not a de Polignac number, because 21122010545 - 2⁸ = 21122010289 is a prime.

It is a super-2 number, since 2×21122010545² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21122010545.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 679370 + ... + 709779.

It is an arithmetic number, because the mean of its divisors is an integer number (3169345725).

Almost surely, 2^21122010545 is an apocalyptic number.

It is an amenable number.

21122010545 is a deficient number, since it is larger than the sum of its proper divisors (4232755255).

21122010545 is a wasteful number, since it uses less digits than its factorization.

21122010545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392195.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 21122010545 its reverse (54501022112), we get a palindrome (75623032657).

The spelling of 21122010545 in words is "twenty-one billion, one hundred twenty-two million, ten thousand, five hundred forty-five".