21403710553653 has 24 divisors (see below), whose sum is σ = 31339016444736. Its totient is φ = 14075423793600.

The previous prime is 21403710553639. The next prime is 21403710553663. The reversal of 21403710553653 is 35635501730412.

21403710553653 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 3 + 7 + 105 + 536 + 5 + 3 = 666.

It is not a de Polignac number, because 21403710553653 - 2¹⁴ = 21403710537269 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21403710553599 and 21403710553608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403710553663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54156768 + ... + 54550553.

It is an arithmetic number, because the mean of its divisors is an integer number (1305792351864).

Almost surely, 2^{21403710553653} is an apocalyptic number.

It is an amenable number.

21403710553653 is a deficient number, since it is larger than the sum of its proper divisors (9935305891083).

21403710553653 is a wasteful number, since it uses less digits than its factorization.

21403710553653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108707625 (or 108707622 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 45.

The spelling of 21403710553653 in words is "twenty-one trillion, four hundred three billion, seven hundred ten million, five hundred fifty-three thousand, six hundred fifty-three".