21693423713280 has 704 divisors, whose sum is σ = 83630143208448. Its totient is φ = 4734441226240.

The previous prime is 21693423713243. The next prime is 21693423713287. The reversal of 21693423713280 is 8231732439612.

It is a tau number, because it is divible by the number of its divisors (704).

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21693423713287) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 65899174 + ... + 66227546.

Almost surely, 2^{21693423713280} is an apocalyptic number.

21693423713280 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 21693423713280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41815071604224).

21693423713280 is an abundant number, since it is smaller than the sum of its proper divisors (61936719495168).

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

21693423713280 is a wasteful number, since it uses less digits than its factorization.

21693423713280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328452 (or 328434 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 51.

The spelling of 21693423713280 in words is "twenty-one trillion, six hundred ninety-three billion, four hundred twenty-three million, seven hundred thirteen thousand, two hundred eighty".