21653554614043 has 4 divisors (see below), whose sum is σ = 23622059578968. Its totient is φ = 19685049649120.

The previous prime is 21653554614037. The next prime is 21653554614047. The reversal of 21653554614043 is 34041645535612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21653554614043 - 2⁹ = 21653554613531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21653554614047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 984252482446 + ... + 984252482467.

It is an arithmetic number, because the mean of its divisors is an integer number (5905514894742).

Almost surely, 2^{21653554614043} is an apocalyptic number.

21653554614043 is a deficient number, since it is larger than the sum of its proper divisors (1968504964925).

21653554614043 is a wasteful number, since it uses less digits than its factorization.

21653554614043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1968504964924.

The product of its (nonzero) digits is 5184000, while the sum is 49.

The spelling of 21653554614043 in words is "twenty-one trillion, six hundred fifty-three billion, five hundred fifty-four million, six hundred fourteen thousand, forty-three".