221047155725 has 12 divisors (see below), whose sum is σ = 299016516480. Its totient is φ = 160761567600.

The previous prime is 221047155701. The next prime is 221047155727. The reversal of 221047155725 is 527551740122.

It is a happy number.

It is not a de Polignac number, because 221047155725 - 2¹⁰ = 221047154701 is a prime.

It is a super-2 number, since 2×221047155725² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221047155727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 401903645 + ... + 401904194.

It is an arithmetic number, because the mean of its divisors is an integer number (24918043040).

Almost surely, 2^221047155725 is an apocalyptic number.

221047155725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221047155725 is a deficient number, since it is larger than the sum of its proper divisors (77969360755).

221047155725 is a wasteful number, since it uses less digits than its factorization.

221047155725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803807860 (or 803807855 counting only the distinct ones).

The product of its (nonzero) digits is 196000, while the sum is 41.

Adding to 221047155725 its reverse (527551740122), we get a palindrome (748598895847).

The spelling of 221047155725 in words is "two hundred twenty-one billion, forty-seven million, one hundred fifty-five thousand, seven hundred twenty-five".