221525045442365 has 32 divisors (see below), whose sum is σ = 304467511211520. Its totient is φ = 151572333072384.

The previous prime is 221525045442341. The next prime is 221525045442377. The reversal of 221525045442365 is 563244540525122.

It is not a de Polignac number, because 221525045442365 - 2¹⁰ = 221525045441341 is a prime.

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, 30834401 + ... + 37333769.

It is an arithmetic number, because the mean of its divisors is an integer number (9514609725360).

Almost surely, 2^{221525045442365} is an apocalyptic number.

It is an amenable number.

221525045442365 is a deficient number, since it is larger than the sum of its proper divisors (82942465769155).

221525045442365 is a wasteful number, since it uses less digits than its factorization.

221525045442365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6501501.

The product of its (nonzero) digits is 11520000, while the sum is 50.

Adding to 221525045442365 its reverse (563244540525122), we get a palindrome (784769585967487).

The spelling of 221525045442365 in words is "two hundred twenty-one trillion, five hundred twenty-five billion, forty-five million, four hundred forty-two thousand, three hundred sixty-five".