221611061235156 has 12 divisors (see below), whose sum is σ = 517092476215392. Its totient is φ = 73870353745048.

The previous prime is 221611061235059. The next prime is 221611061235173. The reversal of 221611061235156 is 651532160116122.

221611061235156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×221611061235156² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9233794218120 + ... + 9233794218143.

It is an arithmetic number, because the mean of its divisors is an integer number (43091039684616).

Almost surely, 2^{221611061235156} is an apocalyptic number.

It is an amenable number.

221611061235156 is an abundant number, since it is smaller than the sum of its proper divisors (295481414980236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221611061235156 is a wasteful number, since it uses less digits than its factorization.

221611061235156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18467588436270 (or 18467588436268 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 221611061235156 in words is "two hundred twenty-one trillion, six hundred eleven billion, sixty-one million, two hundred thirty-five thousand, one hundred fifty-six".