21073635540432 has 80 divisors (see below), whose sum is σ = 60704403240960. Its totient is φ = 6999546758400.

The previous prime is 21073635540343. The next prime is 21073635540439. The reversal of 21073635540432 is 23404553637012.

It is a happy number.

21073635540432 is a `hidden beast` number, since 2 + 1 + 0 + 7 + 3 + 63 + 5 + 540 + 43 + 2 = 666.

It is a super-2 number, since 2×21073635540432² (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 (21073635540439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86678544 + ... + 86921327.

It is an arithmetic number, because the mean of its divisors is an integer number (758805040512).

Almost surely, 2^{21073635540432} is an apocalyptic number.

It is an amenable number.

21073635540432 is an abundant number, since it is smaller than the sum of its proper divisors (39630767700528).

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

21073635540432 is a wasteful number, since it uses less digits than its factorization.

21073635540432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173600169 (or 173600157 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 45.

The spelling of 21073635540432 in words is "twenty-one trillion, seventy-three billion, six hundred thirty-five million, five hundred forty thousand, four hundred thirty-two".