1101056021 has 16 divisors (see below), whose sum is σ = 1239327600. Its totient is φ = 971163648.

The previous prime is 1101055993. The next prime is 1101056057. The reversal of 1101056021 is 1206501011.

It can be written as a sum of positive squares in 8 ways, for example, as 85359121 + 1015696900 = 9239^2 + 31870^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1101056021 is a prime.

It is a super-2 number, since 2×1101056021² = 2424648722760704882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101056521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21515 + ... + 51623.

It is an arithmetic number, because the mean of its divisors is an integer number (77457975).

Almost surely, 2^1101056021 is an apocalyptic number.

It is an amenable number.

1101056021 is a deficient number, since it is larger than the sum of its proper divisors (138271579).

1101056021 is a wasteful number, since it uses less digits than its factorization.

1101056021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30248.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1101056021 is about 33182.1642000639. The cubic root of 1101056021 is about 1032.6103460090.

Adding to 1101056021 its reverse (1206501011), we get a palindrome (2307557032).

It can be divided in two parts, 11010560 and 21, that multiplied together give a triangular number (231221760 = T₂₁₅₀₄).

The spelling of 1101056021 in words is "one billion, one hundred one million, fifty-six thousand, twenty-one".