21001012007 has 2 divisors, whose sum is σ = 21001012008. Its totient is φ = 21001012006.

The previous prime is 21001011947. The next prime is 21001012049. The reversal of 21001012007 is 70021010012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001012007 - 2⁶ = 21001011943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001011982 and 21001012000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001012057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500506003 + 10500506004.

It is an arithmetic number, because the mean of its divisors is an integer number (10500506004).

Almost surely, 2^21001012007 is an apocalyptic number.

21001012007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001012007 is an equidigital number, since it uses as much as digits as its factorization.

21001012007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 14.

Adding to 21001012007 its reverse (70021010012), we get a palindrome (91022022019).

The spelling of 21001012007 in words is "twenty-one billion, one million, twelve thousand, seven".