21124201311 has 12 divisors (see below), whose sum is σ = 32118668920. Its totient is φ = 13341600720.

The previous prime is 21124201279. The next prime is 21124201313. The reversal of 21124201311 is 11310242112.

21124201311 is a `hidden beast` number, since 2 + 112 + 420 + 131 + 1 = 666.

It is not a de Polignac number, because 21124201311 - 2⁵ = 21124201279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124201313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61766500 + ... + 61766841.

Almost surely, 2^21124201311 is an apocalyptic number.

21124201311 is a deficient number, since it is larger than the sum of its proper divisors (10994467609).

21124201311 is a wasteful number, since it uses less digits than its factorization.

21124201311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123533366 (or 123533363 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21124201311 its reverse (11310242112), we get a palindrome (32434443423).

The spelling of 21124201311 in words is "twenty-one billion, one hundred twenty-four million, two hundred one thousand, three hundred eleven".