8275221981 has 64 divisors (see below), whose sum is σ = 13934592000. Its totient is φ = 4811555520.

The previous prime is 8275221973. The next prime is 8275222031. The reversal of 8275221981 is 1891225728.

It is not a de Polignac number, because 8275221981 - 2³ = 8275221973 is a prime.

It is a super-2 number, since 2×8275221981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8275221901) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2872900 + ... + 2875778.

It is an arithmetic number, because the mean of its divisors is an integer number (217728000).

Almost surely, 2^8275221981 is an apocalyptic number.

It is an amenable number.

8275221981 is a deficient number, since it is larger than the sum of its proper divisors (5659370019).

8275221981 is a wasteful number, since it uses less digits than its factorization.

8275221981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3351 (or 3345 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 8275221981 is about 90968.2471030414. The cubic root of 8275221981 is about 2022.6770685583.

The spelling of 8275221981 in words is "eight billion, two hundred seventy-five million, two hundred twenty-one thousand, nine hundred eighty-one".