21946207170253 has 4 divisors (see below), whose sum is σ = 21961458184320. Its totient is φ = 21930956156188.

The previous prime is 21946207170221. The next prime is 21946207170421. The reversal of 21946207170253 is 35207170264912.

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 21946207170253 - 2⁵ = 21946207170221 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21946207170197 and 21946207170206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21946207170553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7625504875 + ... + 7625507752.

It is an arithmetic number, because the mean of its divisors is an integer number (5490364546080).

Almost surely, 2^{21946207170253} is an apocalyptic number.

It is an amenable number.

21946207170253 is a deficient number, since it is larger than the sum of its proper divisors (15251014067).

21946207170253 is a wasteful number, since it uses less digits than its factorization.

21946207170253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15251014066.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 21946207170253 in words is "twenty-one trillion, nine hundred forty-six billion, two hundred seven million, one hundred seventy thousand, two hundred fifty-three".