21413265645 has 16 divisors (see below), whose sum is σ = 34264078272. Its totient is φ = 11419457280.

The previous prime is 21413265641. The next prime is 21413265647. The reversal of 21413265645 is 54656231412.

It is not a de Polignac number, because 21413265645 - 2² = 21413265641 is a prime.

It is a super-3 number, since 3×21413265645³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413265641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150630 + ... + 255960.

It is an arithmetic number, because the mean of its divisors is an integer number (2141504892).

Almost surely, 2^21413265645 is an apocalyptic number.

It is an amenable number.

21413265645 is a deficient number, since it is larger than the sum of its proper divisors (12850812627).

21413265645 is a wasteful number, since it uses less digits than its factorization.

21413265645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118892.

The product of its digits is 172800, while the sum is 39.

The spelling of 21413265645 in words is "twenty-one billion, four hundred thirteen million, two hundred sixty-five thousand, six hundred forty-five".