21653064611233 has 4 divisors (see below), whose sum is σ = 23621525030448. Its totient is φ = 19684604192020.

The previous prime is 21653064611219. The next prime is 21653064611237. The reversal of 21653064611233 is 33211646035612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21653064611233 - 2⁹ = 21653064610721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21653064611233.

It is not an unprimeable number, because it can be changed into a prime (21653064611237) 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, 984230209591 + ... + 984230209612.

It is an arithmetic number, because the mean of its divisors is an integer number (5905381257612).

Almost surely, 2^{21653064611233} is an apocalyptic number.

It is an amenable number.

21653064611233 is a deficient number, since it is larger than the sum of its proper divisors (1968460419215).

21653064611233 is a wasteful number, since it uses less digits than its factorization.

21653064611233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968460419214.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 21653064611233 in words is "twenty-one trillion, six hundred fifty-three billion, sixty-four million, six hundred eleven thousand, two hundred thirty-three".