21221140207 has 2 divisors, whose sum is σ = 21221140208. Its totient is φ = 21221140206.

The previous prime is 21221140183. The next prime is 21221140217. The reversal of 21221140207 is 70204112212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221140207 - 2¹⁹ = 21220615919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221140217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610570103 + 10610570104.

It is an arithmetic number, because the mean of its divisors is an integer number (10610570104).

Almost surely, 2^21221140207 is an apocalyptic number.

21221140207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221140207 is an equidigital number, since it uses as much as digits as its factorization.

21221140207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 21221140207 its reverse (70204112212), we get a palindrome (91425252419).

The spelling of 21221140207 in words is "twenty-one billion, two hundred twenty-one million, one hundred forty thousand, two hundred seven".