1056061421 has 2 divisors, whose sum is σ = 1056061422. Its totient is φ = 1056061420.

The previous prime is 1056061393. The next prime is 1056061423. The reversal of 1056061421 is 1241606501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 937033321 + 119028100 = 30611^2 + 10910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1056061421 is a prime.

It is a super-3 number, since 3×1056061421³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

Together with 1056061423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1056061423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528030710 + 528030711.

It is an arithmetic number, because the mean of its divisors is an integer number (528030711).

Almost surely, 2^1056061421 is an apocalyptic number.

It is an amenable number.

1056061421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1056061421 is an equidigital number, since it uses as much as digits as its factorization.

1056061421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1056061421 is about 32497.0986551107. The cubic root of 1056061421 is about 1018.3484168463.

Adding to 1056061421 its reverse (1241606501), we get a palindrome (2297667922).

The spelling of 1056061421 in words is "one billion, fifty-six million, sixty-one thousand, four hundred twenty-one".