21413455500 has 96 divisors (see below), whose sum is σ = 62488258560. Its totient is φ = 5698142400.

The previous prime is 21413455477. The next prime is 21413455519. The reversal of 21413455500 is 555431412.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 703599 + ... + 733401.

It is an arithmetic number, because the mean of its divisors is an integer number (650919360).

Almost surely, 2^21413455500 is an apocalyptic number.

21413455500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21413455500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31244129280).

21413455500 is an abundant number, since it is smaller than the sum of its proper divisors (41074803060).

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

21413455500 is a wasteful number, since it uses less digits than its factorization.

21413455500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30304 (or 30292 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 21413455500 its reverse (555431412), we get a palindrome (21968886912).

The spelling of 21413455500 in words is "twenty-one billion, four hundred thirteen million, four hundred fifty-five thousand, five hundred".