21013145300 has 54 divisors (see below), whose sum is σ = 53043194862. Its totient is φ = 7204505280.

The previous prime is 21013145291. The next prime is 21013145311. The reversal of 21013145300 is 354131012.

It can be written as a sum of positive squares in 3 ways, for example, as 4917655876 + 16095489424 = 70126^2 + 126868^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2139299 + ... + 2149098.

Almost surely, 2^21013145300 is an apocalyptic number.

21013145300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013145300 is an abundant number, since it is smaller than the sum of its proper divisors (32030049562).

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

21013145300 is a wasteful number, since it uses less digits than its factorization.

21013145300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288425 (or 4288411 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21013145300 its reverse (354131012), we get a palindrome (21367276312).

The spelling of 21013145300 in words is "twenty-one billion, thirteen million, one hundred forty-five thousand, three hundred".