1156267505221 has 16 divisors (see below), whose sum is σ = 1218798822528. Its totient is φ = 1094763384000.

The previous prime is 1156267505201. The next prime is 1156267505299. The reversal of 1156267505221 is 1225057626511.

It is not a de Polignac number, because 1156267505221 - 2²⁹ = 1155730634309 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 (1156267505201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9278890 + ... + 9402676.

It is an arithmetic number, because the mean of its divisors is an integer number (76174926408).

Almost surely, 2^{1156267505221} is an apocalyptic number.

It is an amenable number.

1156267505221 is a deficient number, since it is larger than the sum of its proper divisors (62531317307).

1156267505221 is a wasteful number, since it uses less digits than its factorization.

1156267505221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127932.

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 1156267505221 in words is "one trillion, one hundred fifty-six billion, two hundred sixty-seven million, five hundred five thousand, two hundred twenty-one".