21020130302320 has 40 divisors (see below), whose sum is σ = 49125024765936. Its totient is φ = 8364487077888.

The previous prime is 21020130302317. The next prime is 21020130302323. The reversal of 21020130302320 is 2320303102012.

It is an interprime number because it is at equal distance from previous prime (21020130302317) and next prime (21020130302323).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×21020130302320² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020130302323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680688262 + ... + 680719141.

Almost surely, 2^{21020130302320} is an apocalyptic number.

21020130302320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020130302320 is an abundant number, since it is smaller than the sum of its proper divisors (28104894463616).

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

21020130302320 is a wasteful number, since it uses less digits than its factorization.

21020130302320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361407609 (or 1361407603 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21020130302320 its reverse (2320303102012), we get a palindrome (23340433404332).

The spelling of 21020130302320 in words is "twenty-one trillion, twenty billion, one hundred thirty million, three hundred two thousand, three hundred twenty".