221565210101125 has 16 divisors (see below), whose sum is σ = 301650962408640. Its totient is φ = 161138334618000.

The previous prime is 221565210101063. The next prime is 221565210101281. The reversal of 221565210101125 is 521101012565122.

It is not a de Polignac number, because 221565210101125 - 2²¹ = 221565208003973 is a prime.

It is a super-2 number, since 2×221565210101125² (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 15 ways as a sum of consecutive naturals, for example, 80569165935 + ... + 80569168684.

It is an arithmetic number, because the mean of its divisors is an integer number (18853185150540).

Almost surely, 2^{221565210101125} is an apocalyptic number.

221565210101125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221565210101125 is a deficient number, since it is larger than the sum of its proper divisors (80085752307515).

221565210101125 is a wasteful number, since it uses less digits than its factorization.

221565210101125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161138334645 (or 161138334635 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 34.

Adding to 221565210101125 its reverse (521101012565122), we get a palindrome (742666222666247).

The spelling of 221565210101125 in words is "two hundred twenty-one trillion, five hundred sixty-five billion, two hundred ten million, one hundred one thousand, one hundred twenty-five".