221421207455125 has 32 divisors (see below), whose sum is σ = 292597210414080. Its totient is φ = 166712231660800.

The previous prime is 221421207455099. The next prime is 221421207455177. The reversal of 221421207455125 is 521554702124122.

It is a de Polignac number, because none of the positive numbers 2^k-221421207455125 is a prime.

It is a super-2 number, since 2×221421207455125² (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 31 ways as a sum of consecutive naturals, for example, 71409792 + ... + 74445958.

It is an arithmetic number, because the mean of its divisors is an integer number (9143662825440).

Almost surely, 2^{221421207455125} is an apocalyptic number.

221421207455125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221421207455125 is a deficient number, since it is larger than the sum of its proper divisors (71176002958955).

221421207455125 is a wasteful number, since it uses less digits than its factorization.

221421207455125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3070518 (or 3070508 counting only the distinct ones).

The product of its (nonzero) digits is 448000, while the sum is 43.

Adding to 221421207455125 its reverse (521554702124122), we get a palindrome (742975909579247).

The spelling of 221421207455125 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred seven million, four hundred fifty-five thousand, one hundred twenty-five".