21124203211 has 8 divisors (see below), whose sum is σ = 22291462800. Its totient is φ = 19962489600.

The previous prime is 21124203203. The next prime is 21124203223. The reversal of 21124203211 is 11230242112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21124203211 - 2³ = 21124203203 is a prime.

It is a super-2 number, since 2×21124203211² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124203511) 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, 1378666 + ... + 1393903.

It is an arithmetic number, because the mean of its divisors is an integer number (2786432850).

Almost surely, 2^21124203211 is an apocalyptic number.

21124203211 is a deficient number, since it is larger than the sum of its proper divisors (1167259589).

21124203211 is a wasteful number, since it uses less digits than its factorization.

21124203211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2772989.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21124203211 its reverse (11230242112), we get a palindrome (32354445323).

The spelling of 21124203211 in words is "twenty-one billion, one hundred twenty-four million, two hundred three thousand, two hundred eleven".