21828201693 has 4 divisors (see below), whose sum is σ = 29104268928. Its totient is φ = 14552134460.

The previous prime is 21828201641. The next prime is 21828201701. The reversal of 21828201693 is 39610282812.

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 21828201693 - 2²² = 21824007389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21828201293) 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, 3638033613 + ... + 3638033618.

It is an arithmetic number, because the mean of its divisors is an integer number (7276067232).

Almost surely, 2^21828201693 is an apocalyptic number.

It is an amenable number.

21828201693 is a deficient number, since it is larger than the sum of its proper divisors (7276067235).

21828201693 is an equidigital number, since it uses as much as digits as its factorization.

21828201693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7276067234.

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 21828201693 in words is "twenty-one billion, eight hundred twenty-eight million, two hundred one thousand, six hundred ninety-three".