21404143311 has 16 divisors (see below), whose sum is σ = 29005061088. Its totient is φ = 14038128000.

The previous prime is 21404143309. The next prime is 21404143349. The reversal of 21404143311 is 11334140412.

It is not a de Polignac number, because 21404143311 - 2¹ = 21404143309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404143391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177400 + ... + 272541.

It is an arithmetic number, because the mean of its divisors is an integer number (1812816318).

Almost surely, 2^21404143311 is an apocalyptic number.

21404143311 is a deficient number, since it is larger than the sum of its proper divisors (7600917777).

21404143311 is a wasteful number, since it uses less digits than its factorization.

21404143311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450202.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21404143311 its reverse (11334140412), we get a palindrome (32738283723).

The spelling of 21404143311 in words is "twenty-one billion, four hundred four million, one hundred forty-three thousand, three hundred eleven".