21211411124 has 12 divisors (see below), whose sum is σ = 37121513604. Its totient is φ = 10605264384.

The previous prime is 21211411079. The next prime is 21211411127. The reversal of 21211411124 is 42111411212.

It can be written as a sum of positive squares in 2 ways, for example, as 455822500 + 20755588624 = 21350^2 + 144068^2 .

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21211411096 and 21211411105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211411127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13262 + ... + 206394.

It is an arithmetic number, because the mean of its divisors is an integer number (3093459467).

Almost surely, 2^21211411124 is an apocalyptic number.

It is an amenable number.

21211411124 is a deficient number, since it is larger than the sum of its proper divisors (15910102480).

21211411124 is a wasteful number, since it uses less digits than its factorization.

21211411124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220594 (or 220592 counting only the distinct ones).

The product of its digits is 128, while the sum is 20.

Adding to 21211411124 its reverse (42111411212), we get a palindrome (63322822336).

The spelling of 21211411124 in words is "twenty-one billion, two hundred eleven million, four hundred eleven thousand, one hundred twenty-four".