21126066545400 has 96 divisors (see below), whose sum is σ = 65638641893760. Its totient is φ = 5620900704640.

The previous prime is 21126066545399. The next prime is 21126066545401. The reversal of 21126066545400 is 454566062112.

It is an interprime number because it is at equal distance from previous prime (21126066545399) and next prime (21126066545401).

It is a super-2 number, since 2×21126066545400² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126066545401) by changing a digit.

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, 39474732 + ... + 40006331.

It is an arithmetic number, because the mean of its divisors is an integer number (683735853060).

Almost surely, 2^{21126066545400} is an apocalyptic number.

21126066545400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21126066545400 is an abundant number, since it is smaller than the sum of its proper divisors (44512575348360).

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

21126066545400 is a wasteful number, since it uses less digits than its factorization.

21126066545400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79481525 (or 79481516 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 21126066545400 in words is "twenty-one trillion, one hundred twenty-six billion, sixty-six million, five hundred forty-five thousand, four hundred".