21023032011020 has 96 divisors (see below), whose sum is σ = 48581071334208. Its totient is φ = 7593941302272.

The previous prime is 21023032011017. The next prime is 21023032011029. The reversal of 21023032011020 is 2011023032012.

It is a self number, because there is not a number n which added to its sum of digits gives 21023032011020.

It is not an unprimeable number, because it can be changed into a prime (21023032011029) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2583362 + ... + 6979958.

It is an arithmetic number, because the mean of its divisors is an integer number (506052826398).

Almost surely, 2^{21023032011020} is an apocalyptic number.

21023032011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023032011020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24290535667104).

21023032011020 is an abundant number, since it is smaller than the sum of its proper divisors (27558039323188).

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

21023032011020 is a wasteful number, since it uses less digits than its factorization.

21023032011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4397019 (or 4397017 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21023032011020 its reverse (2011023032012), we get a palindrome (23034055043032).

The spelling of 21023032011020 in words is "twenty-one trillion, twenty-three billion, thirty-two million, eleven thousand, twenty".