1156156221 has 32 divisors (see below), whose sum is σ = 1711641600. Its totient is φ = 688279680.

The previous prime is 1156156217. The next prime is 1156156237. The reversal of 1156156221 is 1226516511.

1156156221 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1156156221 - 2² = 1156156217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156156201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1257600 + ... + 1258518.

It is an arithmetic number, because the mean of its divisors is an integer number (53488800).

Almost surely, 2^1156156221 is an apocalyptic number.

1156156221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1156156221 is a deficient number, since it is larger than the sum of its proper divisors (555485379).

1156156221 is a wasteful number, since it uses less digits than its factorization.

1156156221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569.

The product of its digits is 3600, while the sum is 30.

The square root of 1156156221 is about 34002.2972900362. The cubic root of 1156156221 is about 1049.5557367718. Note that the first 3 decimals are identical.

The spelling of 1156156221 in words is "one billion, one hundred fifty-six million, one hundred fifty-six thousand, two hundred twenty-one".