221771562137051 has 2 divisors, whose sum is σ = 221771562137052. Its totient is φ = 221771562137050.

The previous prime is 221771562137033. The next prime is 221771562137057. The reversal of 221771562137051 is 150731265177122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221771562137051 - 2¹⁰ = 221771562136027 is a prime.

It is a super-2 number, since 2×221771562137051² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221771562137057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110885781068525 + 110885781068526.

It is an arithmetic number, because the mean of its divisors is an integer number (110885781068526).

Almost surely, 2^{221771562137051} is an apocalyptic number.

221771562137051 is a deficient number, since it is larger than the sum of its proper divisors (1).

221771562137051 is an equidigital number, since it uses as much as digits as its factorization.

221771562137051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1234800, while the sum is 50.

The spelling of 221771562137051 in words is "two hundred twenty-one trillion, seven hundred seventy-one billion, five hundred sixty-two million, one hundred thirty-seven thousand, fifty-one".