1056013121 has 4 divisors (see below), whose sum is σ = 1056236544. Its totient is φ = 1055789700.

The previous prime is 1056013111. The next prime is 1056013159. The reversal of 1056013121 is 1213106501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1213106501 = 157 ⋅7726793.

It is a cyclic number.

It is not a de Polignac number, because 1056013121 - 2¹⁴ = 1055996737 is a prime.

It is a super-2 number, since 2×1056013121² = 2230327423448321282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1056013093 and 1056013102.

It is not an unprimeable number, because it can be changed into a prime (1056013111) 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, 104465 + ... + 114126.

It is an arithmetic number, because the mean of its divisors is an integer number (264059136).

Almost surely, 2^1056013121 is an apocalyptic number.

It is an amenable number.

1056013121 is a deficient number, since it is larger than the sum of its proper divisors (223423).

1056013121 is an equidigital number, since it uses as much as digits as its factorization.

1056013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223422.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1056013121 is about 32496.3555033484. The cubic root of 1056013121 is about 1018.3328915566.

Adding to 1056013121 its reverse (1213106501), we get a palindrome (2269119622).

The spelling of 1056013121 in words is "one billion, fifty-six million, thirteen thousand, one hundred twenty-one".