21221112001007 has 2 divisors, whose sum is σ = 21221112001008. Its totient is φ = 21221112001006.

The previous prime is 21221112000971. The next prime is 21221112001057. The reversal of 21221112001007 is 70010021112212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221112001007 - 2¹⁸ = 21221111738863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221112001007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221112001057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610556000503 + 10610556000504.

It is an arithmetic number, because the mean of its divisors is an integer number (10610556000504).

Almost surely, 2^{21221112001007} is an apocalyptic number.

21221112001007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221112001007 is an equidigital number, since it uses as much as digits as its factorization.

21221112001007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21221112001007 its reverse (70010021112212), we get a palindrome (91231133113219).

The spelling of 21221112001007 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, one thousand, seven".