21153250507 has 2 divisors, whose sum is σ = 21153250508. Its totient is φ = 21153250506.

The previous prime is 21153250409. The next prime is 21153250513. The reversal of 21153250507 is 70505235112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21153250507 is a prime.

It is not a weakly prime, because it can be changed into another prime (21153250577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576625253 + 10576625254.

It is an arithmetic number, because the mean of its divisors is an integer number (10576625254).

Almost surely, 2^21153250507 is an apocalyptic number.

21153250507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21153250507 is an equidigital number, since it uses as much as digits as its factorization.

21153250507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10500, while the sum is 31.

Adding to 21153250507 its reverse (70505235112), we get a palindrome (91658485619).

The spelling of 21153250507 in words is "twenty-one billion, one hundred fifty-three million, two hundred fifty thousand, five hundred seven".