21753467074821 has 4 divisors (see below), whose sum is σ = 29004622766432. Its totient is φ = 14502311383212.

The previous prime is 21753467074817. The next prime is 21753467074847. The reversal of 21753467074821 is 12847076435712.

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 not a de Polignac number, because 21753467074821 - 2² = 21753467074817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21753467074861) 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, 3625577845801 + ... + 3625577845806.

It is an arithmetic number, because the mean of its divisors is an integer number (7251155691608).

Almost surely, 2^{21753467074821} is an apocalyptic number.

It is an amenable number.

21753467074821 is a deficient number, since it is larger than the sum of its proper divisors (7251155691611).

21753467074821 is an equidigital number, since it uses as much as digits as its factorization.

21753467074821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7251155691610.

The product of its (nonzero) digits is 15805440, while the sum is 57.

The spelling of 21753467074821 in words is "twenty-one trillion, seven hundred fifty-three billion, four hundred sixty-seven million, seventy-four thousand, eight hundred twenty-one".