221220046501 has 2 divisors, whose sum is σ = 221220046502. Its totient is φ = 221220046500.

The previous prime is 221220046477. The next prime is 221220046519. The reversal of 221220046501 is 105640022122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201534553476 + 19685493025 = 448926^2 + 140305^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220046501 - 2¹⁵ = 221220013733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221220046001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610023250 + 110610023251.

It is an arithmetic number, because the mean of its divisors is an integer number (110610023251).

Almost surely, 2^221220046501 is an apocalyptic number.

It is an amenable number.

221220046501 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220046501 is an equidigital number, since it uses as much as digits as its factorization.

221220046501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 221220046501 its reverse (105640022122), we get a palindrome (326860068623).

The spelling of 221220046501 in words is "two hundred twenty-one billion, two hundred twenty million, forty-six thousand, five hundred one".