20111221101007 has 2 divisors, whose sum is σ = 20111221101008. Its totient is φ = 20111221101006.

The previous prime is 20111221100987. The next prime is 20111221101043. The reversal of 20111221101007 is 70010112211102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20111221101007 - 2⁷ = 20111221100879 is a prime.

It is a super-2 number, since 2×20111221101007² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111221101067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055610550503 + 10055610550504.

It is an arithmetic number, because the mean of its divisors is an integer number (10055610550504).

Almost surely, 2^{20111221101007} is an apocalyptic number.

20111221101007 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111221101007 is an equidigital number, since it uses as much as digits as its factorization.

20111221101007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 20111221101007 its reverse (70010112211102), we get a palindrome (90121333312109).

The spelling of 20111221101007 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, one hundred one thousand, seven".