221421207457075 has 6 divisors (see below), whose sum is σ = 274562297246804. Its totient is φ = 177136965965640.

The previous prime is 221421207457049. The next prime is 221421207457201. The reversal of 221421207457075 is 570754702124122.

It is not a de Polignac number, because 221421207457075 - 2¹¹ = 221421207455027 is a prime.

It is a super-2 number, since 2×221421207457075² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4428424149117 + ... + 4428424149166.

Almost surely, 2^{221421207457075} is an apocalyptic number.

221421207457075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221421207457075 is a deficient number, since it is larger than the sum of its proper divisors (53141089789729).

221421207457075 is an equidigital number, since it uses as much as digits as its factorization.

221421207457075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8856848298293 (or 8856848298288 counting only the distinct ones).

The product of its (nonzero) digits is 2195200, while the sum is 49.

The spelling of 221421207457075 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred seven million, four hundred fifty-seven thousand, seventy-five".