21011023224 has 48 divisors (see below), whose sum is σ = 57055073400. Its totient is φ = 6985185984.

The previous prime is 21011023223. The next prime is 21011023249. The reversal of 21011023224 is 42232011012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21011023197 and 21011023206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011023223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 357699 + ... + 412274.

Almost surely, 2^21011023224 is an apocalyptic number.

21011023224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21011023224 is an abundant number, since it is smaller than the sum of its proper divisors (36044050176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011023224 is a wasteful number, since it uses less digits than its factorization.

21011023224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770364 (or 770357 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21011023224 its reverse (42232011012), we get a palindrome (63243034236).

It can be divided in two parts, 2101102 and 3224, that added together give a triangular number (2104326 = T₂₀₅₁).

The spelling of 21011023224 in words is "twenty-one billion, eleven million, twenty-three thousand, two hundred twenty-four".