21783532153 has 4 divisors (see below), whose sum is σ = 22290125968. Its totient is φ = 21276938340.

The previous prime is 21783532103. The next prime is 21783532157. The reversal of 21783532153 is 35123538712.

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 21783532153 - 2¹³ = 21783523961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21783532157) 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, 253296843 + ... + 253296928.

It is an arithmetic number, because the mean of its divisors is an integer number (5572531492).

Almost surely, 2^21783532153 is an apocalyptic number.

It is an amenable number.

21783532153 is a deficient number, since it is larger than the sum of its proper divisors (506593815).

21783532153 is an equidigital number, since it uses as much as digits as its factorization.

21783532153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506593814.

The product of its digits is 151200, while the sum is 40.

The spelling of 21783532153 in words is "twenty-one billion, seven hundred eighty-three million, five hundred thirty-two thousand, one hundred fifty-three".