21031144211 has 32 divisors (see below), whose sum is σ = 27555737088. Its totient is φ = 15574083840.

The previous prime is 21031144181. The next prime is 21031144219. The reversal of 21031144211 is 11244113012.

It is not a de Polignac number, because 21031144211 - 2¹⁴ = 21031127827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21031144219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36671 + ... + 208343.

It is an arithmetic number, because the mean of its divisors is an integer number (861116784).

Almost surely, 2^21031144211 is an apocalyptic number.

21031144211 is a deficient number, since it is larger than the sum of its proper divisors (6524592877).

21031144211 is a wasteful number, since it uses less digits than its factorization.

21031144211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171771.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21031144211 its reverse (11244113012), we get a palindrome (32275257223).

The spelling of 21031144211 in words is "twenty-one billion, thirty-one million, one hundred forty-four thousand, two hundred eleven".