21545442300 has 36 divisors (see below), whose sum is σ = 62338147256. Its totient is φ = 5745451200.

The previous prime is 21545442299. The next prime is 21545442301. The reversal of 21545442300 is 324454512.

It is an interprime number because it is at equal distance from previous prime (21545442299) and next prime (21545442301).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21545442301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35908771 + ... + 35909370.

Almost surely, 2^21545442300 is an apocalyptic number.

21545442300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21545442300 is an abundant number, since it is smaller than the sum of its proper divisors (40792704956).

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

21545442300 is a wasteful number, since it uses less digits than its factorization.

21545442300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71818158 (or 71818151 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21545442300 its reverse (324454512), we get a palindrome (21869896812).

The spelling of 21545442300 in words is "twenty-one billion, five hundred forty-five million, four hundred forty-two thousand, three hundred".