21323302020020 has 144 divisors (see below), whose sum is σ = 61196386059648. Its totient is φ = 6134975965440.

The previous prime is 21323302020019. The next prime is 21323302020071. The reversal of 21323302020020 is 2002020332312.

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 = 21323302019974 and 21323302020001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 75938432 + ... + 76218711.

It is an arithmetic number, because the mean of its divisors is an integer number (424974903192).

Almost surely, 2^{21323302020020} is an apocalyptic number.

21323302020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323302020020 is an abundant number, since it is smaller than the sum of its proper divisors (39873084039628).

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

21323302020020 is a wasteful number, since it uses less digits than its factorization.

21323302020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152157190 (or 152157181 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21323302020020 its reverse (2002020332312), we get a palindrome (23325322352332).

The spelling of 21323302020020 in words is "twenty-one trillion, three hundred twenty-three billion, three hundred two million, twenty thousand, twenty".