4271821561 has 8 divisors (see below), whose sum is σ = 4891791744. Its totient is φ = 3654278880.

The previous prime is 4271821553. The next prime is 4271821583. The reversal of 4271821561 is 1651281724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4271821561 - 2³ = 4271821553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4271821561.

It is not an unprimeable number, because it can be changed into a prime (4271821501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 603100 + ... + 610141.

It is an arithmetic number, because the mean of its divisors is an integer number (611473968).

Almost surely, 2^4271821561 is an apocalyptic number.

It is an amenable number.

4271821561 is a deficient number, since it is larger than the sum of its proper divisors (619970183).

4271821561 is a wasteful number, since it uses less digits than its factorization.

4271821561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213751.

The product of its digits is 26880, while the sum is 37.

The square root of 4271821561 is about 65359.1735030363. The cubic root of 4271821561 is about 1622.5734590353.

The spelling of 4271821561 in words is "four billion, two hundred seventy-one million, eight hundred twenty-one thousand, five hundred sixty-one".