21020001300 has 108 divisors (see below), whose sum is σ = 68750703840. Its totient is φ = 5361618240.

The previous prime is 21020001293. The next prime is 21020001307. The reversal of 21020001300 is 310002012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21020001293) and next prime (21020001307).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020001307) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 487030 + ... + 528429.

Almost surely, 2^21020001300 is an apocalyptic number.

21020001300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020001300 is an abundant number, since it is smaller than the sum of its proper divisors (47730702540).

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

21020001300 is a wasteful number, since it uses less digits than its factorization.

21020001300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015502 (or 1015492 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21020001300 its reverse (310002012), we get a palindrome (21330003312).

The spelling of 21020001300 in words is "twenty-one billion, twenty million, one thousand, three hundred".