1157177021 has 64 divisors (see below), whose sum is σ = 1625702400. Its totient is φ = 794534400.

The previous prime is 1157177003. The next prime is 1157177039. The reversal of 1157177021 is 1207717511.

It is an interprime number because it is at equal distance from previous prime (1157177003) and next prime (1157177039).

It is a de Polignac number, because none of the positive numbers 2^k-1157177021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157177051) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2761550 + ... + 2761968.

It is an arithmetic number, because the mean of its divisors is an integer number (25401600).

Almost surely, 2^1157177021 is an apocalyptic number.

1157177021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1157177021 is a deficient number, since it is larger than the sum of its proper divisors (468525379).

1157177021 is a wasteful number, since it uses less digits than its factorization.

1157177021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570.

The product of its (nonzero) digits is 3430, while the sum is 32.

The square root of 1157177021 is about 34017.3047286230. The cubic root of 1157177021 is about 1049.8645391387.

The spelling of 1157177021 in words is "one billion, one hundred fifty-seven million, one hundred seventy-seven thousand, twenty-one".