21220021200024 has 64 divisors (see below), whose sum is σ = 60845938944000. Its totient is φ = 6845168126880.

The previous prime is 21220021200011. The next prime is 21220021200029. The reversal of 21220021200024 is 42000212002212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220021200029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1584522964 + ... + 1584536355.

It is an arithmetic number, because the mean of its divisors is an integer number (950717796000).

Almost surely, 2^{21220021200024} is an apocalyptic number.

21220021200024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21220021200024 is an abundant number, since it is smaller than the sum of its proper divisors (39625917743976).

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

21220021200024 is a wasteful number, since it uses less digits than its factorization.

21220021200024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3169059365 (or 3169059355 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21220021200024 its reverse (42000212002212), we get a palindrome (63220233202236).

The spelling of 21220021200024 in words is "twenty-one trillion, two hundred twenty billion, twenty-one million, two hundred thousand, twenty-four".