221604051001 has 2 divisors, whose sum is σ = 221604051002. Its totient is φ = 221604051000.

The previous prime is 221604050999. The next prime is 221604051041. The reversal of 221604051001 is 100150406122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214892509225 + 6711541776 = 463565^2 + 81924^2 .

It is a cyclic number.

It is not a de Polignac number, because 221604051001 - 2¹ = 221604050999 is a prime.

Together with 221604050999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221604051041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110802025500 + 110802025501.

It is an arithmetic number, because the mean of its divisors is an integer number (110802025501).

Almost surely, 2^221604051001 is an apocalyptic number.

It is an amenable number.

221604051001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221604051001 is an equidigital number, since it uses as much as digits as its factorization.

221604051001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 221604051001 its reverse (100150406122), we get a palindrome (321754457123).

The spelling of 221604051001 in words is "two hundred twenty-one billion, six hundred four million, fifty-one thousand, one".