21145445211 has 64 divisors (see below), whose sum is σ = 32803983360. Its totient is φ = 11981520000.

The previous prime is 21145445201. The next prime is 21145445213. The reversal of 21145445211 is 11254454112.

It is not a de Polignac number, because 21145445211 - 2⁵ = 21145445179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21145445213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16378476 + ... + 16379766.

It is an arithmetic number, because the mean of its divisors is an integer number (512562240).

Almost surely, 2^21145445211 is an apocalyptic number.

21145445211 is a deficient number, since it is larger than the sum of its proper divisors (11658538149).

21145445211 is a wasteful number, since it uses less digits than its factorization.

21145445211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648.

The product of its digits is 6400, while the sum is 30.

Adding to 21145445211 its reverse (11254454112), we get a palindrome (32399899323).

The spelling of 21145445211 in words is "twenty-one billion, one hundred forty-five million, four hundred forty-five thousand, two hundred eleven".