21211220024 has 32 divisors (see below), whose sum is σ = 41573683200. Its totient is φ = 10133566560.

The previous prime is 21211220021. The next prime is 21211220039. The reversal of 21211220024 is 42002211212.

It is a junction number, because it is equal to n+sod(n) for n = 21211219984 and 21211220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211220021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521732 + ... + 560915.

It is an arithmetic number, because the mean of its divisors is an integer number (1299177600).

Almost surely, 2^21211220024 is an apocalyptic number.

It is an amenable number.

21211220024 is a deficient number, since it is larger than the sum of its proper divisors (20362463176).

21211220024 is a wasteful number, since it uses less digits than its factorization.

21211220024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082763 (or 1082759 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21211220024 its reverse (42002211212), we get a palindrome (63213431236).

The spelling of 21211220024 in words is "twenty-one billion, two hundred eleven million, two hundred twenty thousand, twenty-four".