21900371867057 has 4 divisors (see below), whose sum is σ = 21903716973936. Its totient is φ = 21897026760180.

The previous prime is 21900371867039. The next prime is 21900371867089. The reversal of 21900371867057 is 75076817300912.

It is a happy number.

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 21900371867057 - 2¹⁴ = 21900371850673 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21900371866993 and 21900371867011.

It is not an unprimeable number, because it can be changed into a prime (21900371867557) 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, 1672543619 + ... + 1672556712.

It is an arithmetic number, because the mean of its divisors is an integer number (5475929243484).

Almost surely, 2^{21900371867057} is an apocalyptic number.

It is an amenable number.

21900371867057 is a deficient number, since it is larger than the sum of its proper divisors (3345106879).

21900371867057 is an equidigital number, since it uses as much as digits as its factorization.

21900371867057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3345106878.

The product of its (nonzero) digits is 4445280, while the sum is 56.

The spelling of 21900371867057 in words is "twenty-one trillion, nine hundred billion, three hundred seventy-one million, eight hundred sixty-seven thousand, fifty-seven".