21545023525100 has 72 divisors (see below), whose sum is σ = 47454797365248. Its totient is φ = 8488614024000.

The previous prime is 21545023525087. The next prime is 21545023525169. The reversal of 21545023525100 is 152532054512.

It is a happy number.

It is a super-2 number, since 2×21545023525100² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76930325 + ... + 77209875.

Almost surely, 2^{21545023525100} is an apocalyptic number.

21545023525100 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 21545023525100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23727398682624).

21545023525100 is an abundant number, since it is smaller than the sum of its proper divisors (25909773840148).

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

21545023525100 is a wasteful number, since it uses less digits than its factorization.

21545023525100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291135 (or 291128 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 21545023525100 its reverse (152532054512), we get a palindrome (21697555579612).

The spelling of 21545023525100 in words is "twenty-one trillion, five hundred forty-five billion, twenty-three million, five hundred twenty-five thousand, one hundred".