21221100007 has 2 divisors, whose sum is σ = 21221100008. Its totient is φ = 21221100006.

The previous prime is 21221099987. The next prime is 21221100013. The reversal of 21221100007 is 70000112212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221100007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221100067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610550003 + 10610550004.

It is an arithmetic number, because the mean of its divisors is an integer number (10610550004).

Almost surely, 2^21221100007 is an apocalyptic number.

21221100007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221100007 is an equidigital number, since it uses as much as digits as its factorization.

21221100007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 21221100007 its reverse (70000112212), we get a palindrome (91221212219).

The spelling of 21221100007 in words is "twenty-one billion, two hundred twenty-one million, one hundred thousand, seven".