21230030023220 has 12 divisors (see below), whose sum is σ = 44583063048804. Its totient is φ = 8492012009280.

The previous prime is 21230030023193. The next prime is 21230030023277. The reversal of 21230030023220 is 2232003003212.

It can be written as a sum of positive squares in 2 ways, for example, as 14507978216356 + 6722051806864 = 3808934^2 + 2592692^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1061501501161 = 21230030023220 / (2 + 1 + 2 + 3 + 0 + 0 + 3 + 0 + 0 + 2 + 3 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 21230030023192 and 21230030023201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530750750561 + ... + 530750750600.

It is an arithmetic number, because the mean of its divisors is an integer number (3715255254067).

Almost surely, 2^{21230030023220} is an apocalyptic number.

21230030023220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230030023220 is an abundant number, since it is smaller than the sum of its proper divisors (23353033025584).

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

21230030023220 is a wasteful number, since it uses less digits than its factorization.

21230030023220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061501501170 (or 1061501501168 counting only the distinct ones).

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

Adding to 21230030023220 its reverse (2232003003212), we get a palindrome (23462033026432).

The spelling of 21230030023220 in words is "twenty-one trillion, two hundred thirty billion, thirty million, twenty-three thousand, two hundred twenty".