1021221077 has 2 divisors, whose sum is σ = 1021221078. Its totient is φ = 1021221076.

The previous prime is 1021221073. The next prime is 1021221133. The reversal of 1021221077 is 7701221201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 836424241 + 184796836 = 28921^2 + 13594^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021221077 - 2² = 1021221073 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021221073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510610538 + 510610539.

It is an arithmetic number, because the mean of its divisors is an integer number (510610539).

Almost surely, 2^1021221077 is an apocalyptic number.

It is an amenable number.

1021221077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021221077 is an equidigital number, since it uses as much as digits as its factorization.

1021221077 is an evil number, because the sum of its binary digits is even.

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

The square root of 1021221077 is about 31956.5498294168. The cubic root of 1021221077 is about 1007.0242369042.

Adding to 1021221077 its reverse (7701221201), we get a palindrome (8722442278).

The spelling of 1021221077 in words is "one billion, twenty-one million, two hundred twenty-one thousand, seventy-seven".