21273023397600 has 864 divisors, whose sum is σ = 85340736280800. Its totient is φ = 4943064268800.

The previous prime is 21273023397599. The next prime is 21273023397617. The reversal of 21273023397600 is 679332037212.

21273023397600 is a `hidden beast` number, since 2 + 1 + 2 + 7 + 3 + 0 + 2 + 3 + 39 + 7 + 600 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 499709116 + ... + 499751684.

It is an arithmetic number, because the mean of its divisors is an integer number (98774000325).

Almost surely, 2^{21273023397600} is an apocalyptic number.

21273023397600 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 21273023397600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42670368140400).

21273023397600 is an abundant number, since it is smaller than the sum of its proper divisors (64067712883200).

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

21273023397600 is a wasteful number, since it uses less digits than its factorization.

21273023397600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42908 (or 42892 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 45.

The spelling of 21273023397600 in words is "twenty-one trillion, two hundred seventy-three billion, twenty-three million, three hundred ninety-seven thousand, six hundred".