2221999951 has 2 divisors, whose sum is σ = 2221999952. Its totient is φ = 2221999950.

The previous prime is 2221999933. The next prime is 2222000029. The reversal of 2221999951 is 1599991222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2221999951 - 2⁵ = 2221999919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221999895 and 2221999904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221999921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110999975 + 1110999976.

It is an arithmetic number, because the mean of its divisors is an integer number (1110999976).

Almost surely, 2^2221999951 is an apocalyptic number.

2221999951 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221999951 is an equidigital number, since it uses as much as digits as its factorization.

2221999951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 49.

The square root of 2221999951 is about 47138.0944778212. The cubic root of 2221999951 is about 1304.9123708182.

The spelling of 2221999951 in words is "two billion, two hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred fifty-one".