21201210007 has 2 divisors, whose sum is σ = 21201210008. Its totient is φ = 21201210006.

The previous prime is 21201209993. The next prime is 21201210047. The reversal of 21201210007 is 70001210212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201210007 - 2³¹ = 19053726359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201210047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600605003 + 10600605004.

It is an arithmetic number, because the mean of its divisors is an integer number (10600605004).

Almost surely, 2^21201210007 is an apocalyptic number.

21201210007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201210007 is an equidigital number, since it uses as much as digits as its factorization.

21201210007 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 16.

Adding to 21201210007 its reverse (70001210212), we get a palindrome (91202420219).

The spelling of 21201210007 in words is "twenty-one billion, two hundred one million, two hundred ten thousand, seven".