221999306051 has 2 divisors, whose sum is σ = 221999306052. Its totient is φ = 221999306050.

The previous prime is 221999306033. The next prime is 221999306063. The reversal of 221999306051 is 150603999122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221999306051 - 2⁶ = 221999305987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221999305987 and 221999306005.

It is not a weakly prime, because it can be changed into another prime (221999306651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110999653025 + 110999653026.

It is an arithmetic number, because the mean of its divisors is an integer number (110999653026).

Almost surely, 2^221999306051 is an apocalyptic number.

221999306051 is a deficient number, since it is larger than the sum of its proper divisors (1).

221999306051 is an equidigital number, since it uses as much as digits as its factorization.

221999306051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 47.

The spelling of 221999306051 in words is "two hundred twenty-one billion, nine hundred ninety-nine million, three hundred six thousand, fifty-one".