1154026021 has 4 divisors (see below), whose sum is σ = 1154155500. Its totient is φ = 1153896544.

The previous prime is 1154026001. The next prime is 1154026031. The reversal of 1154026021 is 1206204511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1206204511 = 29 ⋅41593259.

It can be written as a sum of positive squares in 2 ways, for example, as 857669796 + 296356225 = 29286^2 + 17215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1154026021 - 2¹⁹ = 1153501733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1154025983 and 1154026001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1154026001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50296 + ... + 69553.

It is an arithmetic number, because the mean of its divisors is an integer number (288538875).

Almost surely, 2^1154026021 is an apocalyptic number.

It is an amenable number.

1154026021 is a deficient number, since it is larger than the sum of its proper divisors (129479).

1154026021 is an equidigital number, since it uses as much as digits as its factorization.

1154026021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129478.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1154026021 is about 33970.9584939842. The cubic root of 1154026021 is about 1048.9107437287.

The spelling of 1154026021 in words is "one billion, one hundred fifty-four million, twenty-six thousand, twenty-one".