10000221961 has 2 divisors, whose sum is σ = 10000221962. Its totient is φ = 10000221960.

The previous prime is 10000221947. The next prime is 10000222019. The reversal of 10000221961 is 16912200001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8689781961 + 1310440000 = 93219^2 + 36200^2 .

It is a cyclic number.

It is not a de Polignac number, because 10000221961 - 2⁵ = 10000221929 is a prime.

It is not a weakly prime, because it can be changed into another prime (10000221941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000110980 + 5000110981.

It is an arithmetic number, because the mean of its divisors is an integer number (5000110981).

Almost surely, 2^10000221961 is an apocalyptic number.

It is an amenable number.

10000221961 is a deficient number, since it is larger than the sum of its proper divisors (1).

10000221961 is an equidigital number, since it uses as much as digits as its factorization.

10000221961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 10000221961 its reverse (16912200001), we get a palindrome (26912421962).

The spelling of 10000221961 in words is "ten billion, two hundred twenty-one thousand, nine hundred sixty-one".