20575186221 has 4 divisors (see below), whose sum is σ = 27433581632. Its totient is φ = 13716790812.

The previous prime is 20575186213. The next prime is 20575186231. The reversal of 20575186221 is 12268157502.

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 20575186221 - 2³ = 20575186213 is a prime.

It is a super-4 number, since 4×20575186221⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20575186221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20575186211) 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, 3429197701 + ... + 3429197706.

It is an arithmetic number, because the mean of its divisors is an integer number (6858395408).

Almost surely, 2^20575186221 is an apocalyptic number.

It is an amenable number.

20575186221 is a deficient number, since it is larger than the sum of its proper divisors (6858395411).

20575186221 is an equidigital number, since it uses as much as digits as its factorization.

20575186221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6858395410.

The product of its (nonzero) digits is 67200, while the sum is 39.

The spelling of 20575186221 in words is "twenty billion, five hundred seventy-five million, one hundred eighty-six thousand, two hundred twenty-one".