21023412411220 has 24 divisors (see below), whose sum is σ = 44645224113000. Its totient is φ = 8314877716992.

The previous prime is 21023412411167. The next prime is 21023412411233. The reversal of 21023412411220 is 2211421432012.

It can be written as a sum of positive squares in 4 ways, for example, as 1342228834116 + 19681183577104 = 1158546^2 + 4436348^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5905451145 + ... + 5905454704.

It is an arithmetic number, because the mean of its divisors is an integer number (1860217671375).

Almost surely, 2^{21023412411220} is an apocalyptic number.

21023412411220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023412411220 is an abundant number, since it is smaller than the sum of its proper divisors (23621811701780).

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

21023412411220 is a wasteful number, since it uses less digits than its factorization.

21023412411220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11810905947 (or 11810905945 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 21023412411220 its reverse (2211421432012), we get a palindrome (23234833843232).

The spelling of 21023412411220 in words is "twenty-one trillion, twenty-three billion, four hundred twelve million, four hundred eleven thousand, two hundred twenty".