21250214507 has 2 divisors, whose sum is σ = 21250214508. Its totient is φ = 21250214506.

The previous prime is 21250214483. The next prime is 21250214539. The reversal of 21250214507 is 70541205212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21250214507 - 2⁶ = 21250214443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21250214507.

It is not a weakly prime, because it can be changed into another prime (21250214407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625107253 + 10625107254.

It is an arithmetic number, because the mean of its divisors is an integer number (10625107254).

Almost surely, 2^21250214507 is an apocalyptic number.

21250214507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250214507 is an equidigital number, since it uses as much as digits as its factorization.

21250214507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 29.

Adding to 21250214507 its reverse (70541205212), we get a palindrome (91791419719).

The spelling of 21250214507 in words is "twenty-one billion, two hundred fifty million, two hundred fourteen thousand, five hundred seven".