21220111024 has 40 divisors (see below), whose sum is σ = 47036219648. Its totient is φ = 9084882240.

The previous prime is 21220110971. The next prime is 21220111027. The reversal of 21220111024 is 42011102212.

It is a super-2 number, since 2×21220111024² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21220110989 and 21220111007.

It is not an unprimeable number, because it can be changed into a prime (21220111027) 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, 10339 + ... + 206269.

Almost surely, 2^21220111024 is an apocalyptic number.

It is an amenable number.

21220111024 is an abundant number, since it is smaller than the sum of its proper divisors (25816108624).

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

21220111024 is a wasteful number, since it uses less digits than its factorization.

21220111024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196913 (or 196907 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21220111024 its reverse (42011102212), we get a palindrome (63231213236).

The spelling of 21220111024 in words is "twenty-one billion, two hundred twenty million, one hundred eleven thousand, twenty-four".