221411631045461 has 4 divisors (see below), whose sum is σ = 221411800434924. Its totient is φ = 221411461656000.

The previous prime is 221411631045439. The next prime is 221411631045499. The reversal of 221411631045461 is 164540136114122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105360350301361 + 116051280744100 = 10264519^2 + 10772710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221411631045461 is a prime.

It is a super-2 number, since 2×221411631045461² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221411631645461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82718690 + ... + 85353411.

It is an arithmetic number, because the mean of its divisors is an integer number (55352950108731).

Almost surely, 2^{221411631045461} is an apocalyptic number.

It is an amenable number.

221411631045461 is a deficient number, since it is larger than the sum of its proper divisors (169389463).

221411631045461 is a wasteful number, since it uses less digits than its factorization.

221411631045461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169389462.

The product of its (nonzero) digits is 138240, while the sum is 41.

Adding to 221411631045461 its reverse (164540136114122), we get a palindrome (385951767159583).

The spelling of 221411631045461 in words is "two hundred twenty-one trillion, four hundred eleven billion, six hundred thirty-one million, forty-five thousand, four hundred sixty-one".