21103320411020 has 24 divisors (see below), whose sum is σ = 44317338731568. Its totient is φ = 8441258475200.

The previous prime is 21103320410947. The next prime is 21103320411049. The reversal of 21103320411020 is 2011402330112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21103320410983 and 21103320411001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1836926 + ... + 6751365.

It is an arithmetic number, because the mean of its divisors is an integer number (1846555780482).

Almost surely, 2^{21103320411020} is an apocalyptic number.

21103320411020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103320411020 is an abundant number, since it is smaller than the sum of its proper divisors (23214018320548).

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

21103320411020 is a wasteful number, since it uses less digits than its factorization.

21103320411020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8711161 (or 8711159 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21103320411020 its reverse (2011402330112), we get a palindrome (23114722741132).

The spelling of 21103320411020 in words is "twenty-one trillion, one hundred three billion, three hundred twenty million, four hundred eleven thousand, twenty".