1154360021 has 4 divisors (see below), whose sum is σ = 1156832352. Its totient is φ = 1151887692.

The previous prime is 1154360017. The next prime is 1154360047. The reversal of 1154360021 is 1200634511.

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.

It is a cyclic number.

It is not a de Polignac number, because 1154360021 - 2² = 1154360017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1154360821) 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, 1235465 + ... + 1236398.

It is an arithmetic number, because the mean of its divisors is an integer number (289208088).

Almost surely, 2^1154360021 is an apocalyptic number.

It is an amenable number.

1154360021 is a deficient number, since it is larger than the sum of its proper divisors (2472331).

1154360021 is an equidigital number, since it uses as much as digits as its factorization.

1154360021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2472330.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1154360021 is about 33975.8741020743. The cubic root of 1154360021 is about 1049.0119264257.

Adding to 1154360021 its reverse (1200634511), we get a palindrome (2354994532).

The spelling of 1154360021 in words is "one billion, one hundred fifty-four million, three hundred sixty thousand, twenty-one".