221421251731145 has 16 divisors (see below), whose sum is σ = 265802824153920. Its totient is φ = 177072130033344.

The previous prime is 221421251731129. The next prime is 221421251731157. The reversal of 221421251731145 is 541137152124122.

It is a cyclic number.

It is not a de Polignac number, because 221421251731145 - 2⁴ = 221421251731129 is a prime.

It is a super-2 number, since 2×221421251731145² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177792626 + ... + 179033684.

It is an arithmetic number, because the mean of its divisors is an integer number (16612676509620).

Almost surely, 2^{221421251731145} is an apocalyptic number.

It is an amenable number.

221421251731145 is a deficient number, since it is larger than the sum of its proper divisors (44381572422775).

221421251731145 is a wasteful number, since it uses less digits than its factorization.

221421251731145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254104.

The product of its digits is 134400, while the sum is 41.

The spelling of 221421251731145 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-one million, seven hundred thirty-one thousand, one hundred forty-five".