21653037453445 has 16 divisors (see below), whose sum is σ = 26097490224000. Its totient is φ = 17246535311808.

The previous prime is 21653037453373. The next prime is 21653037453457. The reversal of 21653037453445 is 54435473035612.

It is a cyclic number.

It is not a de Polignac number, because 21653037453445 - 2⁹ = 21653037452933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21653037453392 and 21653037453401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155328586 + ... + 155467924.

It is an arithmetic number, because the mean of its divisors is an integer number (1631093139000).

Almost surely, 2^{21653037453445} is an apocalyptic number.

It is an amenable number.

21653037453445 is a deficient number, since it is larger than the sum of its proper divisors (4444452770555).

21653037453445 is a wasteful number, since it uses less digits than its factorization.

21653037453445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275292.

The product of its (nonzero) digits is 18144000, while the sum is 52.

The spelling of 21653037453445 in words is "twenty-one trillion, six hundred fifty-three billion, thirty-seven million, four hundred fifty-three thousand, four hundred forty-five".