21214201545 has 24 divisors (see below), whose sum is σ = 37035835200. Its totient is φ = 11232840096.

The previous prime is 21214201543. The next prime is 21214201579. The reversal of 21214201545 is 54510241212.

It is a happy number.

It is not a de Polignac number, because 21214201545 - 2¹ = 21214201543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21214201543) 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 23 ways as a sum of consecutive naturals, for example, 1689525 + ... + 1702034.

It is an arithmetic number, because the mean of its divisors is an integer number (1543159800).

Almost surely, 2^21214201545 is an apocalyptic number.

It is an amenable number.

21214201545 is a deficient number, since it is larger than the sum of its proper divisors (15821633655).

21214201545 is a wasteful number, since it uses less digits than its factorization.

21214201545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391709 (or 3391706 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 21214201545 its reverse (54510241212), we get a palindrome (75724442757).

The spelling of 21214201545 in words is "twenty-one billion, two hundred fourteen million, two hundred one thousand, five hundred forty-five".