21010145245 has 16 divisors (see below), whose sum is σ = 25261891200. Its totient is φ = 16775012800.

The previous prime is 21010145203. The next prime is 21010145281. The reversal of 21010145245 is 54254101012.

It is not a de Polignac number, because 21010145245 - 2¹⁷ = 21010014173 is a prime.

It is a super-2 number, since 2×21010145245² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 8241231 + ... + 8243779.

It is an arithmetic number, because the mean of its divisors is an integer number (1578868200).

Almost surely, 2^21010145245 is an apocalyptic number.

It is an amenable number.

21010145245 is a deficient number, since it is larger than the sum of its proper divisors (4251745955).

21010145245 is a wasteful number, since it uses less digits than its factorization.

21010145245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5156.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 21010145245 its reverse (54254101012), we get a palindrome (75264246257).

The spelling of 21010145245 in words is "twenty-one billion, ten million, one hundred forty-five thousand, two hundred forty-five".