1170157021 has 4 divisors (see below), whose sum is σ = 1276534944. Its totient is φ = 1063779100.

The previous prime is 1170157007. The next prime is 1170157033. The reversal of 1170157021 is 1207510711.

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 1170157021 - 2¹⁹ = 1169632733 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 (1170157061) 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, 53188945 + ... + 53188966.

It is an arithmetic number, because the mean of its divisors is an integer number (319133736).

Almost surely, 2^1170157021 is an apocalyptic number.

1170157021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1170157021 is a deficient number, since it is larger than the sum of its proper divisors (106377923).

1170157021 is a wasteful number, since it uses less digits than its factorization.

1170157021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106377922.

The product of its (nonzero) digits is 490, while the sum is 25.

The square root of 1170157021 is about 34207.5579514235. The cubic root of 1170157021 is about 1053.7753797992.

Adding to 1170157021 its reverse (1207510711), we get a palindrome (2377667732).

The spelling of 1170157021 in words is "one billion, one hundred seventy million, one hundred fifty-seven thousand, twenty-one".