221252406125 has 32 divisors (see below), whose sum is σ = 281167980288. Its totient is φ = 173778696000.

The previous prime is 221252406107. The next prime is 221252406143. The reversal of 221252406125 is 521604252122.

It is an interprime number because it is at equal distance from previous prime (221252406107) and next prime (221252406143).

It is not a de Polignac number, because 221252406125 - 2⁶ = 221252406061 is a prime.

It is a super-2 number, since 2×221252406125² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221252406091 and 221252406100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4144352 + ... + 4197398.

It is an arithmetic number, because the mean of its divisors is an integer number (8786499384).

Almost surely, 2^221252406125 is an apocalyptic number.

221252406125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221252406125 is a deficient number, since it is larger than the sum of its proper divisors (59915574163).

221252406125 is an equidigital number, since it uses as much as digits as its factorization.

221252406125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53670 (or 53660 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 221252406125 its reverse (521604252122), we get a palindrome (742856658247).

The spelling of 221252406125 in words is "two hundred twenty-one billion, two hundred fifty-two million, four hundred six thousand, one hundred twenty-five".