1012770221 has 4 divisors (see below), whose sum is σ = 1013296092. Its totient is φ = 1012244352.

The previous prime is 1012770173. The next prime is 1012770229. The reversal of 1012770221 is 1220772101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 867302500 + 145467721 = 29450^2 + 12061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012770221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012770229) 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, 260036 + ... + 263901.

It is an arithmetic number, because the mean of its divisors is an integer number (253324023).

Almost surely, 2^1012770221 is an apocalyptic number.

It is an amenable number.

1012770221 is a deficient number, since it is larger than the sum of its proper divisors (525871).

1012770221 is an equidigital number, since it uses as much as digits as its factorization.

1012770221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525870.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 1012770221 is about 31824.0509834936. The cubic root of 1012770221 is about 1004.2387479632.

The spelling of 1012770221 in words is "one billion, twelve million, seven hundred seventy thousand, two hundred twenty-one".