21211240124 has 24 divisors (see below), whose sum is σ = 37245616128. Its totient is φ = 10569680240.

The previous prime is 21211240111. The next prime is 21211240129. The reversal of 21211240124 is 42104211212.

It is a junction number, because it is equal to n+sod(n) for n = 21211240096 and 21211240105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211240129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2273429 + ... + 2282739.

It is an arithmetic number, because the mean of its divisors is an integer number (1551900672).

Almost surely, 2^21211240124 is an apocalyptic number.

It is an amenable number.

21211240124 is a deficient number, since it is larger than the sum of its proper divisors (16034376004).

21211240124 is a wasteful number, since it uses less digits than its factorization.

21211240124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11185 (or 11183 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21211240124 its reverse (42104211212), we get a palindrome (63315451336).

The spelling of 21211240124 in words is "twenty-one billion, two hundred eleven million, two hundred forty thousand, one hundred twenty-four".