21320103020 has 12 divisors (see below), whose sum is σ = 44772216384. Its totient is φ = 8528041200.

The previous prime is 21320102987. The next prime is 21320103041. The reversal of 21320103020 is 2030102312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21320102986 and 21320103004.

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, 533002556 + ... + 533002595.

It is an arithmetic number, because the mean of its divisors is an integer number (3731018032).

Almost surely, 2^21320103020 is an apocalyptic number.

21320103020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21320103020 is an abundant number, since it is smaller than the sum of its proper divisors (23452113364).

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

21320103020 is a wasteful number, since it uses less digits than its factorization.

21320103020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066005160 (or 1066005158 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21320103020 its reverse (2030102312), we get a palindrome (23350205332).

The spelling of 21320103020 in words is "twenty-one billion, three hundred twenty million, one hundred three thousand, twenty".